Hi
I was in exactly the same situation as you. Went to hawkstone and tried several demo bikes ,I did the best on the last one I tried, the sherpa ,but it was the first time I had been on a trials bike for 30 years so I put this down to it being the third ride in a couple of hours.
If you havent been on a bike for some time you have no experience with which you can make a rational judgement. I couldnt really tell one from the other. | bought a new 07 beta 250 in the end which was the one I liked the look of the best ( shallow or what) but after listnening to other peoples comments as well, especially the easier maintenance.
I am very happy with the bike and whilst being very nervous of the lively response at the begining I am now getting a bit more confident on the bike and have had 6 sessions on it the fourth being my first trial, incidently I came last, though I was happy just to finish.
Go for it If you have a history witth bikes I am sure you will love it again.
Good luck.