Thank you all for your generous relplies. I think I will go with the PC BN125 18 gauge nailer and see how that goes. I can see that a #16 gauge nailer is a genuine step above the #18, so both might be the long term solution.
Thank you all for your time.
If you're buying the nailers I recommend you pick up a combo kit as it's substantially cheaper than picking up the nailers one at a time. That is unless you want to invest in a higher end compressor, otherwise the small portable type included will do fine for light woodworking. Actually come to think of it the price of those combo kits you basically end up getting the compressor for free once you add up the individual cost of each gun.