I've got the Hodgeman Wadelite IIs ($160). Ditto, the above about how light and comfortable they are compared to neos. I originally bought um after a rare sweltering day in June last year to replace my neos for summer fishing. Fall came along, pulled the neos out again and I discovered a crotch leak that I was too lazy to fix, so I wore the breathables through the winter. As long as I had 3 pairs of socks (1 crew, 2 wool) I had no problems at all.

I'm going on my second summer in them. At the beginning of the summer, I noticed a few leaks and now I've got quite a bit of aquaseal on them, but I think they'll last through another winter (maybe).

All in all, I'd say 2 full years (fishing about 100 days a year) is about all you'll get, and thats probably pretty good for the price.