That looks awesome and should be fine. I don't know why you want a sound card or if it'll work -- audio on the UP5 works great. I also can't say anything about that Bluray drive. Other than that you are 100% on safe ground. Have fun!
That Asus sound card probably won't work in Mountain Lion. Are you planning to dual boot Windows and OSX? If so I strongly recommend you install them on separate hard drives. Which means that I suggest instead of a 500GB SSD may be you should consider getting 2 smaller SSDs, one for each OS.
Otherwise the list seems to be fine.
On a side note, are you sure you want to use Windows 8 instead of Windows 7?