If you are getting an HVLP type, pay attention your your compressor's CFM rating. HVLP stand for high volume, low pressure. You might be surprised just how much volume some guns require.
I bought an Asturo AOM from spraygunworld.com a few years ago specifically because my compressor is somewhat lacking in the volume department. This gun requires less CFM than some other models. With an extra air tank hooked up, I manage to get good results. But it really kept my compressor running when I painted an automotive hood. A larger compressor is extremely high on my list if stuff to acquire before I paint again.
Someone else mentioned this already, but it is so important that it bears repeating - buy a good filter to keep the water out!
P.S. I personally would not shoot gelcoat through an expensive gun. I'd be too worried about the gelcoat kicking, thus ruining the gun. I'd use a cheap gun with a big compressor. But that's just me.
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