I have a 2008 MBP (4,1) with a 200GB regular HD and 4GB of RAM. It's been a good computer. I had the bulging battery issue last year and had that serviced. Other than that, that's the only problem ...
The graphics card is the centerpiece of a PC build. It is usually the most expensive component and can be used for gaming and all sorts of productivity work. These days, your choices are mostly ...