It depends on your budget as some can be just as much as an electro, but then again, real men do it manually.
In my opinion the best ones to look for would be one of the following:
Autocockers
Automags
Sterling Bronze/STP Pump
CCI Phantom Pump
Someone was saying that the Tippmanns only give problems, or something like that anyway. This is not really true. They can be problematic like ALL markers, but generally speaking they will out-last anything made today. Personally I don't like to use them, but I can guarantee they are just as reliable as any of the above, just not quite the same quality.