"Six" series Ruger DA's
including the Speed Six, Service Six (both fixed sights) and the Security Six were, in my opinion, the best medium-frame DA .357s Ruger ever built. I know the GP's are heavier built, maybe stronger- but what they should have done with the "Sixes" was added the front crane lock ALA Redhawk, and left the rest alone. Great guns- I had several over the years, and the fixed-sight models I had were always "on the button" for regulation. Wish they'd bring 'em all back!
As for price, I see a lot of these selling rather high on the auctions. I've seen police trade-ins from wholesalers going for under $200. I'd be reluctant to to pay too much for one of these, and would check the Ruger DA section of Gun List and the pictorla ads in Shotgun News before deciding if it's priced right.
Make you a nice wheelgun if you can buy it right, though,