There is probably only a handfull of VX's with really low miles still out there and the chances of them going up for sale may be slim. I have over 145k on the odometer, lot's have over 100k and deermagnet is closing in on 250k.
Probably the number one thing is to see if the one you are looking at has oil burning issues...if so, stay on top of the oil.
x2!
Hell, when I started looking at VX'es two years ago I came across one 3 hours from me with only 36k on the clock, but it was badly taken care of. Low mileage does not always mean great product. It depends on who owned it before you.