thx for your help everyone. and i will take the suggestions in your post big giant circles.
The info about my rig:
AMD Dual Core 3500+ (3.4 GHz I think)
4 GB DDR2 Ram
300 GB Disk Space
About the type of music I want to make, it varies from day to day. I move from classical orchestra music (my favorite) to simple hip-hop beats to even Chinese and Indian music (I love sitars). Based on this information, any DAW that you recommend. I know that Yoozer said investing in a keyboard and turn the knobs while playing, but I still would enjoy big giant circles' recommendations of an all-on-the-computer solution.
Yes my budget is let's say up to 10,000 U.S. dollars as long as the software is somewhat popular and there will be decent customer support or forums for it. Thanks and btw, I will definitely use zzounds when buying something.