$800 is way too high, even here in the Peoples Republic of California. I will say that while you will always hear someone tell of the one they bought for $75 last week, the prices on then are going up.
The no dash models are the most highly sought after and do command a premium. The prices are somewhat all over the place, but $450~600 (depending on condition) seems to be the going rate. Add about 25% or so for a 2 1/2" barrel and you will be in the ball park.
The somewhat later no dash models with the blued sights are worth considering also. I bought this one two years ago for $300.