What's everyone's favorite mathematical programming language for optimization?

Currently I'm using LINGO (school has license) but I've also played around with GAMS and AMPL. When I need to have data extracted from Excel, I feel LINGO is better (or maybe I'm just biased since I'm used to using LINGO with spreadsheets).

I've also recently seen a new language/software called AIMMS, has anyone used it before? What other languages does everyone else use?