My price for a nice N frame is $350. Sometimes I do better, recently I did worse because I really wanted it and upped my limit. Bought two 8 & 3/8" M27s in past year. A blued one much as you described for $315 and nickeled one in similar shape that I have wanted for a very long time for $421. This was at auction and one other bidder took it up there. All else had dropped out at around $300. A curse on him...
You have to decide what it is worth to you.