computer overload

I need a new computer. No really, my MSI ex625 routinely overheats and shuts down, even with a cooling pad. I don't think it likes Everquest 2. I have taken it apart, redone the thermal glue, cleaned out the fan, and nothing seems to help. It is 3 years old, so I guess it is about time.

For my next computer, though, I want a desktop. I have been playing with the idea of building one myself, but it is a little intimidating. If I were going to build one, I would get something like:

http://www.newegg.com/Special/She...-_-na-_-na

Only problem is, I would need a copy of 64 bit windows (i only have 32), a wireless card, and a graphics card. At which point, I feel like I may as well get a pre-built system. Something like this Dell, for $749



OPERATING SYSTEM Windows® 7 Home Premium, 64Bit, English edit
PROCESSOR 3rd Generation Intel® Core™ i5-3450 processor (up to 3.50 GHz) edit
MICROSOFT SOLUTIONS Microsoft® Office Starter: reduced-functionality Word & Excel w/ ads. No PowerPoint or Outlook edit
SUPPORT 1 Year ProSupport with 1 Year NBD Limited Onsite Service After Remote Diagnosis edit
ACCIDENTAL DAMAGE SERVICE 1 Year Accidental Damage Service edit
MEMORY 8GB Dual Channel DDR3 1600MHz - 2 DIMMs edit
HARD DRIVE 1TB 7200 RPM SATA Hard Drive 6.0 Gb/s edit
VIDEO CARD AMD Radeon™ HD 7570 1GB GDDR5 edit
MCAFEE SECURITYCENTER McAfee SecurityCenter, 15-Months edit
KEYBOARD Dell KB213 Wired Multimedia Keyboard edit
MOUSE Dell Laser Mouse edit
OPTICAL DRIVE 16X CD/DVD burner (DVD+/-RW), write to CD/DVD edit

I know the graphics card on this isn't the best, and it would be up for an upgrade when I found a good deal.

Am I missing something here? Is one of these systems much better than the other? I am basically wanting a system that will play EQII (and some other games, Skyrim, etc), and last me for a while (hopefully longer than 3 years). I know the second system isn't overclockable, but I don't really see that in my future anyway.