Got to disagree with Liam on the Ion front, great gun, cheap cheerful, easy to fix and a plethora of bits avaliable. This gun single handly changed the tourney landscape by being cheap and good and able to keep up with guns much more expensive. The are brilliant and can be picked up here 2nd hand for as little as £40.
Planet eclipse guns are extremely reliable and you will find most people in the UK now shoot Planet guns.
There are lots of good guns for sub £200; Egos/Eteks, DMs, Angels, Creeds etc. My advice would be get down to a local site see what people have and ask to have a go as you may find one type of gun suits your playing style better than another.