Can I change this power supply?

[Nooby]

I already know most of this is compatible but am unsure of a few things.

CPU Intel Core i5-3570K 3.4GHz Quad-Core Processor [4] £177.66 @ CCL Computers

Motherboard Gigabyte GA-Z77X-UD5H ATX LGA1155 Motherboard [5] £140.96 @ Amazon UK

Memory Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory [6] £34.99 @ Scan.co.uk

Storage Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive [7] £66.22 @ Ebuyer

Storage Sandisk Extreme 120GB 2.5" Solid State Disk [8] £72.77 @ Scan.co.uk

Power Supply Corsair 650W ATX12V / EPS12V Power Supply [9] £83.58 @ Scan.co.uk

Optical Drive Sony AD-7261S-0B DVD/CD Writer [10] £15.02 @ CCL Computers

Monitor Asus VE228H 21.5" Monitor [11] £113.06 @ Scan.co.uk

Operating System Microsoft Windows 7 Home Premium SP1 (64-bit) [12] £71.05 @ CCL Computers

Total
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£177.66 @ CCL Computers)
Motherboard: Gigabyte GA-Z77X-UD5H ATX LGA1155 Motherboard (£140.96 @ Amazon UK)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£34.99 @ Scan.co.uk)
Storage: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive (£66.22 @ Ebuyer)
Storage: Sandisk Extreme 120GB 2.5" Solid State Disk (£72.77 @ Scan.co.uk)
Power Supply: Corsair 650W ATX12V / EPS12V Power Supply (£83.58 @ Scan.co.uk)
Optical Drive: Sony AD-7261S-0B DVD/CD Writer (£15.02 @ CCL Computers)
Monitor: Asus VE228H 21.5" Monitor (£113.06 @ Scan.co.uk)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) (£71.05 @ CCL Computers)
Total: £775.31
(Prices include shipping and discounts when available.)
(Generated by PCPartPicker 2012-08-23 20:39 BST+0100)

Prices include shipping and discounts when available. £775.31
Generated by PCPartPicker 2012-08-23 20:14 BST+0100

-no gpu (feel free to give your opinion on this) -case: [amazon-uk]http://www.amazon.co.uk/dp/B006I2H0YS/[/amazon-uk] £60.51

that is my current part list but I need to know If I can make this slightly cheaper by changing the psu to this 600W unit: [amazon-uk]http://www.amazon.co.uk/dp/B001GLFD54[/amazon-uk]
and if there's any other problems you notice I would be greatfully if you could point them out, thanks for any advice

 

[totenkopf4]

I already know most of this is compatible but am unsure of a few things.

CPU Intel Core i5-3570K 3.4GHz Quad-Core Processor [4] £177.66 @ CCL Computers

Motherboard Gigabyte GA-Z77X-UD5H ATX LGA1155 Motherboard [5] £140.96 @ Amazon UK

Memory Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory [6] £34.99 @ Scan.co.uk

Storage Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive [7] £66.22 @ Ebuyer

Storage Sandisk Extreme 120GB 2.5" Solid State Disk [8] £72.77 @ Scan.co.uk

Power Supply Corsair 650W ATX12V / EPS12V Power Supply [9] £83.58 @ Scan.co.uk

Optical Drive Sony AD-7261S-0B DVD/CD Writer [10] £15.02 @ CCL Computers

Monitor Asus VE228H 21.5" Monitor [11] £113.06 @ Scan.co.uk

Operating System Microsoft Windows 7 Home Premium SP1 (64-bit) [12] £71.05 @ CCL Computers

Total
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£177.66 @ CCL Computers)
Motherboard: Gigabyte GA-Z77X-UD5H ATX LGA1155 Motherboard (£140.96 @ Amazon UK)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£34.99 @ Scan.co.uk)
Storage: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive (£66.22 @ Ebuyer)
Storage: Sandisk Extreme 120GB 2.5" Solid State Disk (£72.77 @ Scan.co.uk)
Power Supply: Corsair 650W ATX12V / EPS12V Power Supply (£83.58 @ Scan.co.uk)
Optical Drive: Sony AD-7261S-0B DVD/CD Writer (£15.02 @ CCL Computers)
Monitor: Asus VE228H 21.5" Monitor (£113.06 @ Scan.co.uk)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) (£71.05 @ CCL Computers)
Total: £775.31
(Prices include shipping and discounts when available.)
(Generated by PCPartPicker 2012-08-23 20:39 BST+0100)

Prices include shipping and discounts when available. £775.31
Generated by PCPartPicker 2012-08-23 20:14 BST+0100

-no gpu (feel free to give your opinion on this) -case: [amazon-uk]http://www.amazon.co.uk/dp/B006I2H0YS/[/amazon-uk] £60.51

that is my current part list but I need to know If I can make this slightly cheaper by changing the psu to this 600W unit: [amazon-uk]http://www.amazon.co.uk/dp/B001GLFD54[/amazon-uk]
and if there's any other problems you notice I would be greatfully if you could point them out, thanks for any advice

Nooby - yes you most certainly can change out that PS - in fact if you are not planning to use a GFX card - you could drop the PSW to about 500 Watts as you appear to have only used about 253 Watts per this website. As this represents about a 50% load. But I do suggest that you get a PS w single voltage rails not dual - to confusing to keep track of what plugs into where.
http://www.thermaltake.outervision.com/Power