Not seeing bad performance in My Pre-built System..

This is a basic general feedback from a system ive had for 2 months. Its a Gateway dx4200-09 specs are as follows below.

AMD Phenom™ X4 9100e 64-bit Quad-Core Processor (1.80GHz, 2MB L2 Cache) with AMD64 Technology8
Genuine Windows Vista® Home Premium (64-bit) with SP11
4096MB 800MHz Dual Channel DDR2 SDRAM (2-2048MB modules)
640GB 7200rpm Serial ATA II/300 hard drive with 16MB Cache4
Modern System Design with Red Chrome Branding Strip
Integrated ATI® Radeon™ HD 3200 Hybrid Graphics with up to 256MB of Shared Video Memory (disabled)
Geforce 8800gt 512mb 256-bit GDDR3 (Enabled Main GPU)

Ive played NBA 2k10, Ghostbusters, and Crysis all on Maxx settings @ resolutions 1920x1080 with my 55in Vizio hd tv and/or JVC 60in hdtv.

NBA 2k10 56/fps
GBusters 60/fps
Crysis 49/fps
World of Borecraft (cancelled account) 60fps 40-50 in dalran.

Some say my cpu is bottlenecking my Card or a any future card that i may want.
Some say my card is holding these games back (except wow)!

I just need a lil help cause im debating on building a new system $600usd (monitor not included ). I do not want to build a new pc just for minimal performance in games, need atleast 50% boost in the cpu/gpu area.

That is not possible. What are you using to detect frame rates.

I'd be surprised if you could get 50fps in crysis at 1080p without AA or even the enthusiast settings...

I don't think your measurements are correct sir, I have the hardest time believing you are getting 49 fps in crysis maxed out on 1920x1080! An old videocard with 128 Stream processors if not less with a 1.8Ghz processor+2mb cache and 800mhz ddr2...buddy, some of the highest end GPU's in Xfire and SLI and high end processors and RAM of today costing thousands of dollars have a hard time to maxing out crysis...
And by maxing out, I mean Full resolution, 16xQ AA, 16x AF, All Highest/Enthusiast Settings...
-Well there are other factors that affect this, take into account that Crysis warhead has better performance then the original and patches also improve as well as video drivers so i could be wrong, last time i checked out benchmarks was last year so things could have changed drastically.