a quick glance at the 2nd had market at the moment and quite a lot is well within your budget....im assuming you already have air and hopper here but you could easily get.....
pritty much your pick of ebladed or raced cockers,
a 12 month old angel
a dm4
a proto matrix
any of the older electros...impys etc
a timmy
all depends on your personal choice really......try as many markers as you can and see what you like is the best advise i can offer
dude ive just been in the same situation as you. already been there with an ion and now my back up and i went onto a speed 05. cant go wrong with that beast..u can pick one up for £300- £350 and still have money left over to maybe up it or something.