For our practice space, we were initially happy with a low-end drum kit we got from Craigslist (about $150-200) after we had tuned up the heads.
Later on, when we upgraded the cymbals with set of new Zildjians (about $200), the difference was incredible.
This suggests $300-350 is a good range
-A
THEE DIRTYBEATS maximum vintage garage
http://www.theedirtybeats.com