currently ive been using a BT delta for the past 6 months and i am thinking of going for an electronic marker. so the question is what marker(second hand or not) would be advised as my budget will be about £200-£250 although i was also thinking of saving a couple months and buying a new etek 3.
I don't agree with everybody saying to save up and get an Etek 3. You will be able to pick up a good marker for your budget with no problems.
You could get an Etek 2, Ego 7, maybe an Ego 8, DM7, PM8, PM9, Invert Mini, etc...
Personally I'm using an Ego 7, cost me £250 and shoots perfectly, very consistent, not too bad on air, doesn't break paint, no problems with it at all.
If you've got a budget now I say go for something that is within your current budget asd you can still pick up something that will do perfectly well without spending loads of money.