"Depends on your budget really." Agree with this.
CPU: Don't buy dual core becouse that's old tehnology. Ofcourse you know that. It's better to buy Core2Quad Q6600 (it's kinda cheap proc with older tehnology but still a really goog one) Core i7 is probably the best proc on the market but expensive.
Graphic card: Agree with remus. Just take something with 512Mb DDR3, DirectX 10 compatible (9600, 9800) Avoid seres 7*** 
HDD: 320 - 500 Gb (WD is fine) SATA-2 are not so expencive
RAM: 4Gb
This is my machine, and I also use that software that you've been mentioned and I don't have any problems.
MB: ASUS P5Q
CPU: Intel C2Q Q9550 ; 2,83GHz ; 12Mb (see on web for more details, it's very good proc)
Graphic: Nvidia Gainward 9600GT GS 512Mb DDR3
HDD: WD 500Gb
RAM: 4Gb Kingston Hyper-X 800
CPU Cooler: Zero Term Katana2
Power supply: XSpice Kira 630w
Hope this will help you.
Beautiful... Can't even imagine that this is SU model...