I'm with glennaa11 on this. If you're happy with what you have, I don't see a reason to add it. They make all of these different cameras because there are that many different demographic markets. Some people want a P&S, some people want 4/3rds, some want DSLRs and some want MF or LF. Some are like you and have use for more than one type with a clear defined boundary. Some have to have one of every segment. Some only have use for one. Only right or wrong answer is what works for you.