sunn do some good hardtails. i had a sun drac was a good bike. light enough to fling around on the trac, but easy enough to ride on the road too.
sunn forest jump is good too. reasonable price aswell.
have a look on southerndownhill.com forum if your looking at second hand, have a big classfieds section, and theres lots of info on there to give you ideas of what you want.