Thanks for the quick reply. It's good to know that you can use a second drive in the dvd drive bay.
I'm very on the fence about this.
I currently have a latitude e6520 i7-2620m and I'm really digging the screen, esata (use this a lot), and firewire (video editing). I'm kinda worried about giving those up unless I'm convinced of the benefits.
What about the elitebook series? Is it close enough that it would be similarly hackable with good results?
Also how is the 6470m? I know my 4200m kinda sucks. Notebookcheck's graphic card page doesn't look like it's any more promising.