I just read a post on another board by Mike M about keeping things simple and having 1 type of fixture that you use all the time for 1 type of effect. This is what I've always done. I probably use only 7 types of fixtures to achieve every conceivable effect. It makes sense since you'll always have replacement parts on board. You'll have consistency and continuity throughout your designs. I do not in any way believe this will limit one as a designer. There is so much unnecesary product in most manufaturers catalogue that it's rediculous. Unique used to be quite simple and they are falling into the same trap with all of these repetitive fixtures. Trying to be everything to everybody. cast seems to be staying simple and effective. My feeling is that you should master 1 type of fixture for 1 type of effect (or more) and use that fixture the same way everytime. Lamps I try to limit as well. Maybe 10 types at most. I don't want to have trouble sourcing a lamp during maintenance . I can't go back because I didn't have 1 lamp. that would be a losing proposition.