Need a new PC for photoshop work at home....

Was thinking this might do the trick
BB-I5754A Novatech Barebone Bundle - Intel Core i5 750 - 4GB DDR3 1333Mhz - Intel P55 Motherboard - ATX Black Gaming Case & 750w PSU : novatech.co.uk

with a graphic card and some disks I'm away....

What do you think?

Also, was thinking two SATA hard disks, one for OS/Apps and one for Data....
Obviously the largest I can afford for the Data - but is there much in performance of drives these days for the OS disk?