The HT is a great boat and the durability is not an issue. I used to co-own an HT and the current owner of the boat has flipped it MANY times and there have been no serious issues. I sail on a different HT fairly often and we have driven it really hard and not had a problem. I am still impressed with the boats durability actually.
Only problem is that it has a lot of sail for a boat its size and at 160 you may have trouble with it when wind is above 10 or so (maybe even less).
For 4k I don't think you could go wrong with it really. It is lighter than almost all the other boats- with the exception of the f16 and a cats obviously.