I always liked the Dangerous Power G4, as it is easy to maintain, fairly inexpensive, and shoots just as well as $1000+ guns. Put a TechT engine in it and you're set. I'm not into speedball as much as woodsball, so I'm not familiar with the differences between the different spool-valve guns, but I have heard very good things about the G4 and when I've fired and played with it, I've never had a problem. I suppose it all comes down to personal opinion on what you want the marker to do and what you want its strengths and weaknesses to be. Ask someone who's been in speedball a while.
Treat your gun right...OR I WILL KILL YOU!
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Rocking drop-forwards like they're going out of style...oh, wait...
My join date doesn't show it, but I've been 'ballin' awhile...