There's a form in my signature that you could fill out for more help, but for now I would recommend against the dual 4850s in favor of a 5770 or 5850. Also, you'll want to get AM3, DDR3. Some more suggestions as well, but I recommend you fill out the sticky first to be sure.
Posted at almost the exact same time . Either of the little pages with the lightning bolt in the bottom right of your post should allow you to edit. A single 5770 would be plenty for that resolution and higher. For overclocking especially you should consider the 955 BE. Assuming crossfire is a no, I recommend this motherboard
The reason why I can't purchase a 5850 or a 5770 is because they'll both go over my budget. With 2 4850's, I'll stay close to my budget. Also, I believe the CPU has an AM3 socket, and the RAM is DDR3.
jbaker, I love how you're suggesting better items, but I'm already at the very top of my budget ($750). The CPU and PSU are both more expensive than what I currently have. Unfortunately, according to http://shopbot.ca, no Canadian store sells that brand of RAM. Also, according to http://shopbot.ca, no Canadian store sells that model of the motherboard. If they did, I would've switched my components. :S
For anyone reading this thread: after doing a bit of research, I found a few reasons why having a 5770 is better than 2 4850's.
1) DirectX 11 Support
2) In the future, I can upgrade my rig by just buying another 5770, and putting that in CrossFire, which is much cheaper than buying two new graphics cards.
3) 4000 series is dying. The latest technology is better, because in a few years, they will be obsolete.
4) Eyefinity support.