I agree with Aaron, Simms are top of the line stuff. With the Simms, your looking at waders that will last many years and Simms will repair them for you free. I have a buddy in Idaho who fishes 150 days a year. He's had a pair of Simms G3 since 2001 and finally had a leak and sent them in for repair, which they did for free. Based on his experience, I got my wife a pair of G4s for Xmas.
If you're a 2XL, Sierra Trading Post has some clearance deals on Simms G3s as well as some others:
Search: Waders at Sierra Trading Post
Here's a bunch of on-line coupons to use at Sierra Trading Post which should save you 15%:
http://www.couponmountain.com/Sierra...ons-deals.html
Most shops carry the G3 waders for $400. With the coupon you're at $246, that's if you fit a 2XL. You can make do with lesser models and brands. The fishing in the Sierras is mostly from the bank as opposed to actual wading. If you do wade, it's not very deep.