The 75B Omega would be a great first gun. It is a little less expensive and also less expensive to upgrade if you choose to do so later. It has a better trigger out of the box than either the traditional 75B or the SP01. It also upgrades very nicely. I also think a first gun should be a full size so that you can master your shooting techniques. Once learned they will translate down to a compact, PCR or P01 with ease.