I have had my IRH helemt since I was...oh 10 or 12??? It still fits, still looks amazing(it's velvet and has held up extreamly well) is comfortable, doesn't make my head sweat and was reasonably priced. I don't know what they are going for now days but that's my 2 cents.
I use a Eurohunter Hi Lite Pro for both showing and schooling. I've got one for schooling and one for showing. I also used to have a Dublin Onyx which I really liked and an Aussie Rider which I absolutely hated (hello bubble head!).