Thanks for the input, all. It really sounds like the best option is to invest in a new rig by keeping the existing SSD and HDD, and upgrading the case, PSU, MB, processor, RAM & video card. Budget time!
I was really impressed by the previous peformance improvements I got from 1. Vista 32 to Win 7 64 and 2. SSD for boot disk. Kinda bummed it doesn't make sense to go further, at least cost effectively. However, I am happy both of those prior investments can be moved over to the new rig so not all is lost. Thanks again for all the input.