Buying online will probably give you the best deal, but it is always nice to see and touch it first. Good alignment is vital to precise turning. You should be able to put a MT-2 with a taper point in the head stock and in the tail stock that will touch precisely point to point when brought together. There should be no side to side slop when the tail stock is loose. To me, this is the best test of a quality lathe. The head stock should have no slop or movement as well. Misalignment can translate to vibration in your top.
I have gotten by with belts and pulleys for over 10 years now, but a variable speed drive would definitely be nice.
Good luck.