I should probably bring YH-1 and YH-3 as well so you can hear all the major yamahas. The YH-2 is pretty much a YH-3 in a noisier, italian-designed frame. I have a yh-2 but it doesn't work properly at the moment. The HP-50 is a HP/YH-3 with a single-entry cable, and mine isn't damped yet.
See, this is my problem with meets. I start thinking about what to bring, and within minutes i'm rationalizing that i shouldn't not bring the modern fostex to compare with the vintage yamaha.