So far, those are good choices but keep some things in mind. The motherboard is good, but if you're going to be using Crossfire, you may want a 790FX motherboard as it offers 16X speeds on both PCI-Express X16 slots while populated. The
GIGABYTE GA-MA790FXT-UD5P AM3 DDR3 AMD 790FX is such a motherboard. The Phenom II 955 is a better value than the 965 as the processors are both pretty much identical, but the 955 costs less. So, to get 965 speeds on a 955, you just need to change the multiplier which is super easy. Also, always consider getting SATA drives as they are faster. The Radeon 5770 suggested above is a fine choice, go for it. Also, if you're planning on overclocking past 3.5GHz. you may need to purchase an aftermarket CPU heatsink and fan, like the
Thermaltake CL-P0456 140mm CPU Cooler or, if you don't have as much cash to spend, the
XIGMATEK HDT-S1283 120mm Rifle CPU Cooler. Remember, larger fans are more efficient and, typically, quieter.