here goes feel free to negative feedback it and pick it apart:
Gigabyte 990 FXA UD5 or UD 7 motherboard about 100 bux
Apevia X dreamer case about 60 bux (Apevia cases are absolutely amazing having an incredible fan system)
Corsair Ram its gone up recently and is kind of expensive make other choices are good as well but my experience is corsair always make sure your ram sticks match both in size and voltage
Geforce 650+ graphics card minimum its a very good price running about 100 bux just make sure whatever card you decide on is a 256 bit card not a 128 bit card
1 TB hard drive with 7200 RPM or fi you want more your better off buying two 1 TB hard drives you can do an internal/external or internal/internal or external/external why? because the 1 TB hard drives tend to be stabler than the 2 and 3 TB hard drives
monitor is totally up to you what size you prefer just make sure its capable of 1080P
Power Supply at least a 750 personally I am a fan of thermaltake power supplies
processor I personally use the phenom II black 965 processor because its an amazingly good processor even though its older, you can also upgrade to a 1080 etc etc just make sure its at LEAST a quad core and 3.2 to 3.4 GHZ
not sure if I left anything out but this entire system will run you about 700 bux start to finish depending on current market prices
BTW i recommend against APU type processors for several reasons which I am not going to go into here