Pete,
T2 kicks it over HS2 in my opinion. Although I did love the movie so that may influence me a bit. Having owned both T2 I woul like again. Has to be LED'd and a sub kit brings it into a new realm.
Price wise - hard to find a HS2 without cab fade, but Wayne's decals for these are amazing. Also insert wear is very common. I would think $2500 to $3000 max should get you a nice one shopped and in good shape.
For a T2 - tough as they don't come up all that often. I would think privately between $2500 to $3000 as well. Just watch for broken plastics as some are very hard to find.