It depends on what your'e going to use them for. The HW35 is their elite, light weight hunting gun, they usually come with swivel mounts for a strap. Whereas the HW97 and TX 200 are more benchrest guns. If you start with the HW35, get a strap for it. The HW35 will push you towards free hand shooting and using the strap as a shooting aid, you need to be comfortable with that.
I started with an HW30, then progressed to an HW95 and finally an HW100. In retrospect, I feel 8 pounds is the sweet spot and I prefer carbines. My wife and daughter don't like the weight or cocking effort of the HW95, although I do. They love the HW30. I found the HW100 a bit heavy, so I bought a titanium air cylinder from HW100tuning in England, which reduces weight about 11 ounces. It made a world of difference in handling. I put straps on the HW95 and HW100.
So the HW30 is for family and guests. The HW95 is my survival gun. The HW100 is for ... whatever. I love them all.