| Cheap is not nececcarily unreliable. Nor indeed secondhand. Modern scuba kit is pretty good stuff. However, buying secondhand is perhaps better left for when you have a little experience/confidence.
Scubapro is good stuff, as is Apeks. The cheaper range from either of them will give very good service.
I have just bought the new Scubapro Mk11 (€220) and its very good so far. The Mk2 is cheaper still and a very good reg and very very reliable as it hasn't much on it to go wrong. (Which is why its cheap of course)
DIN avoids O ring problems and would be my prefered choice over yoke fitting.
Most problems with regulator stem from poor servicing - save your worries for getting that right - there are plenty of people on here that will help you find a good shop.
Chris
[edit] looks like the recommendation from Fiona is the one to go for as Ian says their servicing is good too... [/edit]
__________________ "It is better to buy a Reliant Robin and be thought a wanker than to buy a four wheel drive and remove all doubt" Mark Twain |