I wish I knew
Have had so much great advice from you all. I've been going to sleep all weekend with HW40s, FAS604s, IZH46s, Alfa Sports, Taus, B96s etc and all the review information whirling around my head....
Going to try a Tau 7 secondhand at my club weds night. Sounds like it might be bargain, and providing using CO2 doesn't seem difficult I might just have to buy it.
Watch this space.....