I'd vote for a S&W617. Here are a few random thoughts on DA .22 revolvers:
-commonly found, new or used
-lots of aftermarket parts
-lots of configurations over the years- 6 or 10 shot cylinders; 4", 6", or 8-3/8" barrel lengths, target hammers/triggers available
-newer versions are easily scoped- with cylinder open, look for holes in topstrap. Scope base mounts from above.
-I'd shy away from the early 10-shot cylinders that were made of aluminum alloy. I've never had one, but lots of folks shy away from them, which would make resale more difficult.
S&W K-22, 17, 18, etc.
-older guns are neat in their own right
-many think the older hand fit/finish can't be beat
-prices going up, but shouldn't lose money as long as well maintained
-I've never owned an older S&W, so can't personally comment further
-sights are adjustable for windage only
-4" full shroud, 4" half shroud, 2-1/4" full shroud barrel options
-I have two, I think of them more as plinkers than hunting tools. Just not as refined as a S&W, IMHO.
Colt DA .22 revolvers
-pricier, but should only go up in value w/proper maintenance
-never owned one, never even shot one
-never owned or shot one
-I like the concept of interchangeable barrels
-intermittent production, different ownership interests of company
-check the forums, I've read posts from dedicated DW fans who have not been happy with their .22 offerings.
Thoughts on barrel length for hunting: Longer barrels will tend to yield higher velocity. Longer barrels are not necessarily inherently more accurate. Longer barrels will give a better sight radius if hunting with iron sights, appearing to be more accurate. That advantage is negated when the revolver is scoped.