Just buy a Core i7 860/930 if the graphic programs that you use do support HyperThreading, otherwise the Phenom II X6 1055T if they don't. Don't get the original Phenom X4 series though, they're pretty weak compared to the new generation.
What is your budget though? For $100, an Athlon II X4. For $200, a Phenom II X6 1055T. For $300, a Phenom II X6 1090T Black Edition if the programs you use do not support HyperThreading, otherwise if they do a Core i7 860/930, and as FALC0N said, you can pick up an i7 980X for $1000 or so if you want. I suggest you go for the i7 930 platform if your programs do support HyperThreading, and are RAM heavy.
What is your budget? Your answer will vary greatly depends on your total budget for the system upgrade.
I have no limit for budget and I'm using the Adobe CS4 and CS5 applications.
Just buy a Core i7 860/930 if the graphic programs that you use do support HyperThreading, otherwise the Phenom II X6 1055T if they don't. ...... .
Thanks for the helpful info. but, how can I know that Adobe CS4 or CS5 applications support hyperThreading: