since I'm a cheap non-producer, I've been using the Sennheiser PX-100 line since 2006
I've used just about every single iteration except for the PMX-100 and the PX-100 II's. This includes the PX-200, PMX-200, and I'm currently using a pair of PX-200 II's. They tend to last about a year but that's not too bad considering how badly I abuse them. Also I've gotten them at $40-$50 apiece so it's pretty good value for my money.