Turntable.. Schmurntable...
A turntable only needs to do 3 things to be Perfect:
1. Turn at the prescribed speed (e.g. 33rpm) with minimal fluctuation.
2. Impart no vibration/resonance of it's own to the cartridge/arm.
3. Be shielded or designed well enough that the cartridge/armwire is not adversely affected by any magnetic or electrical field from the TT.
That is ALL a turntable can possibly do - PERIOD! There is no Black Magic about spinnin' a freakin' platter at a steady speed. The basic technology to accomplish this was in place somewhere between the invention of the wheel and the early 20th century.
Most of the TT's mentioned here meet those 3 criteria reasonably well.
Everything else being argued about is actually a function of the cartridge, the tonearm, the cartridge/tonearm matching, the quality of the arm wire/output jacks.
So my advice to the original poster, at $600 - buy whichever of these looks the coolest to you (or your wife), won't break the bank, and won't be too much of pain to keep running properly. I've had 15 or 20 of these types of turntables to play with, and I can say without doubt (assuming the quality of TT's already mentioned here) the choice of cartridge is by far the more important factor. And unfortunately that does get into a much more personal, subjective preference.