I would also recommend the Crosman 2240. I customised one for less than £100 a few years back but got bored with it and sold it on here.

A few months back I realised I missed it - so bought another as they are so cheap. I use it a lot but have no desire to customise again - it is great as a powerful plinker as delivered.

I realise that I have now recommended two Crosman pistols - and I am basically a huge Webley fan!