06-16-08: Tvad
...I'd recommend putting the money toward isolation for the table.
True dat. I've gotten some of my most significant improvements in clarity, jump, inner detail, and dynamics from isolation. In my case, I have $20 in PartsExpress/Dayton threaded brass cones to replace the feet, a $25 butcher block cutting board from Ikea, and Vibrapods I had lying around the house.
If I had a little more to spend on isolation, I'd get Mapleshade brass cones and maple board or KAB's Isonoe threaded feet. Then there's the Gingko Cloud as another viable option. I definitely got a big improvement moving to a less resonant, more rigid rack (that was actually less expensive than the welded steel rack it replaced).
That $45 probably wrought the biggest improvement overall. It also creates a better baseline for hearing other improvements, such as better cartridge, headshell, fluid damper, etc.