What a bargain there... nice machine for the price.
Really, a SSD would be fantastic for your rig. But i think you should get a better PSU because you must protect all of your investments.
I'm just throwing it out, but OCZ Vertex 4 prices are dropping and are great SSD's. Would be a really nice upgrade.
If you don't mind, i'll give you a air cooler suggestion: EVGA Superclock (i think it's compatible with AM3+...)