If there is contact on the housing, it's not rebuildable.
If it was JUST shaft play or an oil leak then they are rebuildable, but housing contact means new housings and at least a cartridge rebuild.
If the wheels made housing contact, the bearings are shot and it's just a matter of time before it either seizes or completely comes apart.
What size sticks did you want to go with? That's gonna determine what you'll need as far as turbo.
I tell ya what, I've been REALLY impressed with the HTT 64/71 that we had at the shop. For a single turbo of that size, it spools REALLY well, but it's also being pushed by 150 HP sticks.
Also, how heavy do you tow?