I can thoroughly recommend the fixed sight, Uberti 8" barrel Remington NMA in blued finish which is priced at a very reasonable £320 from Henry Krank and other dealers. I have owned a few Uberti revolvers over the years and have always found them to be excellent straight out of the box. The trigger weights have never needed tweaking and the timing on all the ones I have owned over the years has been perfect with no evidence of the bolt producing the commonly seen line around the circumference of the cylinder. As you are probably aware, the foresight is drift adjustable, so once set, there is probably no need to touch it again while leaving the gun looking more like the original. I also own a stainless ROA and have not found that stainless guns are any more resistant to corrosion provided a proper cleaning regime is employed, so why pay more for something that in my opinion anyway, detracts from the original looking appearance. Although plated finishes were available for some original revolvers which may look similar in appearance to stainless, I'm afraid for me anyway they just don't look quite right for the period. I also have a nitro-conversion 1858 NMA revolver and it's perhaps telling that the manufacturer settled on the standard Uberti Remington as the basis for his products.
Regards
Brian