Of course the LOWER the better
I like to use the 400 rule for N frame 'smiths which have little collecter interest. Anything much past 425 should have something going for it like pre'60 [ sort of a cut-off for VERY well made Smiths], box and all paperwork, close to unfired or of special interest. I know that in some parts of the USA you can't find certain guns so it might be the 'ole " I've been looking for a 98%+ M25-2 for 20 years " so 450-475 would be OK. Just think of all the $1,000s that you've spent in gas...dewey