IMac 21.5" performance on COD4 and few other general questions from a newbi

I'm a current and long time PC owner who is sick of messing with registry problems, performance issues and viruses.
I am strongly considering the purchase of a 21.5" iMac, but have some reservations as to whether I may have performance issues playing Call of Duty 4 using Parallels or Boot Camp. Will the 21.5" machine with the upgraded 256K video card handle this and other games OK? Other than that, I am a light user who mainly surfs the web, sends email and tracks finances with quicken. Games and some video are about the heaviest applications I use.
Currently on a 3 year old Pentium Duo Dell with 2GB ram, 512mb Nvidia video card.

I'm just extremely concerned that the 21.5" iMac won't have enough juice for multi-tasking such as playing COD4 while surfing the net. Even my hopped up gaming PC (older dual core with 512K video card) struggles at times. I'm wanting to make the jump to Mac, just afraid of spending almost $1500+ and winding up with worse performance than I already have.
Unfortunately, the nearest Mac retailer is over an hour away from me so there isn't a real chance to put one through it's paces in person.

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