Definitely go with the Intel setup. It's WELL worth the extra money - and will outperform the AMD chip by quite a bit in gaming, and by a huge amount in CAD, Solidworks and that sort of thing. (taking my last year of Industrial Systems Engineering)
You could save a bit of money and go with the P67 chipset boards as well, for most people they do just as much. Asus makes the P67 Pro:
The reason I ask, is because I've read and heard people say that you're Video Card will make or break you're gaming system much more than you're CPU. So am I better off throwing an extra $100 (my swing based on the choice) at the CPU/mobo or at the video card (i.e. from ~$250 up to ~$350).
The video card is more important than the CPU when it comes to some games, however others are the other way around, but generally, most need a balance of both.
Honestly, you'd be better off going with an i3-2100 than a Phenom 955 anyway. Either way, Sandy Bridge is really the way to go right now, unless you are looking at a really low-budget machine.
A 2500k will future-proof you quite a bit more, can be overclocked like crazy, will give you better performance in games and way more performance in normal applications (especially engineering ones). You won't regret buying one. I bought two haha.
these have been my questions as well, and it does not seem like there is a straight answer. i guess we need to see more benchmarks. i would say it is highly dependent on the res you will be using, and if the extra pricing is worth it to you. here's my thread: http://www.tomshardware.com/forum/312851-31-gaming-syst...