I have Shinko 005 Advances on my DRZ for $200 out the door. So far they seem to do well. I wheelie and stoppie the crap out of the bike on my commute to work. Work well enough for offroad but they arent a knobby.
Another cheap tire to look at is the Shinko 009 Raven. I havnt run this tire yet but its on the list. I know others have used this tire on a motard and liked it.