try and get one which has internal eyes(dm3) and a evolve bolt fitted as well. the evolve kit will help with the efficiency(shots per tank). stock bolts are a bit of a gas hog if your going to be playing a lot of rec/woods 'ball. I've owned 3 in the past and I want another one now. heavy as mentioned compared to today's markers but so accurate due to this weight downfall and just as fast as today's markers with the right board fitted.ie tadao m5/7.
£100-120 should get you a really good one with all the upgrades
I'd sooner have one of these than an ion for example price comparison wise.