Yep...A standalone graphics card can and does give you better graphics performance than an onboard integrated accelerator.
Seriously, L_M, ever considered building your own? Get a PC 'tailored' to your specific requirements, whereby you can put forward your money for some very very very good equipment.
The site I mentioned earlier, www.hkgolden.com, can give you references to the prices of most products you require. I know it's in Chinese, but get Google to translate it for you and you'll get an idea about the cost of putting together your 'dream PC'.
ever thought about buying AMD instead of Intel's "evil inside" processors?