If it's in the caliber you want, then buy it.
Two things about Vanguards:
1. If you can get it to shoot well with the factory plastic stock, wonderful. If not, then an excellent upgrade is to install a Bell & Carlson Medalist stock, free float the barrel and bed the rifle.
2. If you like the factory trigger, wonderful. If not, you can often find a Timney trigger for under $100 that will be much nicer.
Note that the "S2" model of the Vanguard is now instores with a better plastic stock and a much better trigger. If you can find one, it's probably worth the price difference to purchase it unless you really like the "original" model.
See here: Vanguard Series 2