seems fine, depends on what you want to use it for and what screen you got.
If you could get 2x2gb ram it would be better, if not it is not a big deal.
Also the 2320 and 2400 have the same price on newegg
CORSAIR Vengeance 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Profile Desktop Memory Model CML4GX3M2A1600C9
Limited time Shell Shocker® deal $19.99 free shipping.
PSU should be fine, 6770 only uses about 100W, maxed out.
Rosewill DESTROYER Black Gaming ATX Mid Tower Computer Case, comes with Three Fans-1x Front Blue LED 120mm Fan, 1x Top 120mm Fan, 1x Rear 120mm Fan, option Fans-2x Side 120mm Fan, 1x Top 120mm Fan, 1x Bottom Fan $49.99 $1.99 shipping Comes with 3 fans http://www.newegg.com/Product/Product.aspx?Item=N82E168...