In addition to what T-bone said, I think you should take a look at a Denon DP-500M turntable. It lists at $699 most places, but if you Google for online vendors, one or two will pop up in the $545 range. The Denon should sound better out-of-the-box than the Technics, as it's a much more recent release (2005 vs. 1981), is targeted at the home market, and has significant vibration control built into the physical design. I suspect the tonearm has a bit higher effective mass as well, because Denon recommends several of their low-to-mid compliance MC cartridges for it--the DL-110/160, DL-103, DL-301, etc.
There aren't as many aftermarket tweaks available for the Denon as the Technics, but then, maybe it doesn't need them. There's a review on A-gon, and one of the respondents claims to have retro-fitted an SME tonearm, so I guess there's room to grow.
And you can always improve a sub-$1500 turntable's sound by putting it on an isolation platform and getting a clamp or weight for it. The Denon is also open to aftermarket headshells, which change the tonearm's effective mass and resonance rigidity characteristics.
There aren't as many aftermarket tweaks available for the Denon as the Technics, but then, maybe it doesn't need them. There's a review on A-gon, and one of the respondents claims to have retro-fitted an SME tonearm, so I guess there's room to grow.
And you can always improve a sub-$1500 turntable's sound by putting it on an isolation platform and getting a clamp or weight for it. The Denon is also open to aftermarket headshells, which change the tonearm's effective mass and resonance rigidity characteristics.