ahh, well from my experience, i built a rangemaster, but changed a the input and output caps to make it more of a full boost for my bass and i love it. the only problem with the rangemaster and those that are built off it are a little noisey. for me it wasn't enough to bother me, but something to keep in mind.
i haven't built many boosts, mostly OD's and Fuzzes, so i'm sure others may have more insight. with minimal changes, i'm pretty sure you can turn almost any Si boost into a Ge boost, just by adjusting the bias resistors, and if you're using a PNP transistor you'ld have to reverse any of the electrolyics, and reverse the polarity for the power to the board.