Its a good price, I have to point out that theres no software out there yet that can take advantage of quad core technology, therefore I'm unsure if its any advantage over dual core. The graphics is fairly basic as well - rest of the spec looks ok though.
Only concern I ever have when buying a branded PC is if you decide to upgrade the graphics card later on would you also need to upgrade the power supply?
Having said that, you mention you don't play shoot em up games so the 8300GS would probably do you.
Have you seen a widescreen monitor in use? Reason I ask is I don't like them personally. Pop into your local PC World and try it out with some of the programs and you might see what I mean. You get a band of unused space down either side. Its brilliant for games but look for yourself and see what you think.