Thanks McCreed, I'd certainly like to hear more about what you've learnt over the last couple of years.
It looks like Phrozin's favourite guns are both HVLP. I get the impression that a compressor to suit an HVLP gun is going to be expensive, and take up a lost of space for something that I don't use that frequently. I was hoping a touch up gun and a small compressor was a viable option, really.