The scubapro's are great both the X650 with the recent upgrade and the G250 is also another great choice.
Both the apeks and the legend are duplicates of the G250, with slightly different parts so as not to infringe on copyrights. I was not impressed with the variation in the apeks, I have yet to pull apart a legend so I can't say anything about the internal parts on that one.
The Scubapro first stage will outflow the apeks without question, and is a good all around first stage. The apeks is also well made, the internals are very simmilar to the majority of diagphram regs.