Two things Fenken commented on I have to agree with.
The 128GB SSD is fine to fit your OS, Antivirus, a few applications (like Steam & Google Chrome, etc.) & like a few video games.. But I think I've been told the performance decreases as a SSD is near capacity. Also, 128GB is not that much space, especially when you take into account a game like SKYRIM is 6GB (4.68% of that hard drive space) Personally, I have a 64 GB SSD & a 1.5TB HDD. I just put windows & the antivirus ontop of a few other programs in the SSD, but I put everything else into the HDD.

Secondly, the PSU comment is spot on. 600W is probably the lowest end PSU I would even consider for a gaming PC. Luckily if you purchase a 2nd gen Intel i5/i7 processor you don't have the power consumption needs like my i7-960 has. (Granted, if you are buying a 2GB GDDR5 GPU with a 256-bit interface, you wouldn't need the CPU with an additional GPU provided with the second gen processors, but I'd stick with what you have already chosen)
If you want to create a PC to play the current games on the highest graphics settings right now, the 600W PSU will do fine. (I think)
The PSU will probably not meet your requirements in about a year or two if you want to play the future games on even higher graphics settings.