I'd go with the Superwinch as long as it's in good condition and the wire rope won't need replaced anytime soon (steel and synthetic both aren't cheap).
I've had a Warn m8000 that was tough as nails and some experience with a Bulldog (one of the cheaper newer brands out lately), and can say with 100% confidence that paying a little extra for one of the big 3 (warn, Ramsey, Superwinch) and even milemarker, is going to be worth it if your truly going to be using it a good bit.
8000 may be on weeeeeeee bit low side but the times that you'll have worry about that can be always solved with the snatch block you should be carrying anyways.
A 10k winch would be awfullllly heavy on the front of a T4R.
Goodluck in your purchase and enjoy the security of having a winch!!!
- Jeff