Hi John, I once owned a T-Rex and I miss it a bit, it is a great mount, but not ideal if you only own Newts imho.
I think there are better options in your case, either:
1. rebuild a dob base with better materials (easy to do) or
2. spend the cash on an AZ-EQ6 which has the flexibility to suit a range of scopes and applications.
If you get the T-Rex I foresee a very happy used buyer down the track or a change of telescope type.
Edit: there's also someone on IIS that's sells replacement dob mounts so you don't have to do it yourself
http://gondwanatelescopes.com/custom-dobsonian-mounts.