Re: A Few Concerns..
More RAM would certainly help, but it would be kind of silly to get it. 4GB of DDR2 800MHz is only slightly less expensive than 8GB of DDR3 1600MHz, a waste if you plan on upgrading in the near future.
Considering that you can reuse your PSU, GPU, hard drive, and optical drive, it shouldn't be terribly expensive to upgrade to an 1155 setup, or even an AMD setup if you really want to keep costs down. I might suggest a case with better air flow though.
Do you have a front intake fan in your case? If so I'd try cleaning up those cables to increase air flow, try tucking the slack either behind the HDD cage, or into an empty bay (but not in front of the fan, if you have one).
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X