Don't make the mistake of buying grips so big you may as well carry a K or L frame sized gun.
Very true, at least for pocket carry anyway. If one wants to belt carry a very lightweight revolver, then that could be an exception.
If you ask 2 dozen people what the best stocks for a snubbie are, you will probably get 2 dozen different answers.
So I guess it depends on what you want to do with it.
For pocket carry, you probably want to keep the grips small. For this reason, I prefer the standard Uncle Mikes boot grips that come installed on S&W x42s. Steven Camp has a great review of different grips for J Frames here:
http://www.hipowersandhandguns.com/Getting a Grip on J Frames.htm. He also prefers the Uncle Mikes. They may not be the most comfortable, but they do the job (for me anyway) and unlike some other rubber grips, they don't cling to clothing.
Uncle Mikes boot grips on my 642:
For belt/IWB carry or for nightstand-only duty, you have a lot more options since size doesn't matter so much. The only consideration is that for carry you might want to stick with wood or a rubber/sythetic grip that doesn't hang up on clothing. A snub K-Frame or Ruger Six is on my wish list; I will probably have wood stocks on it since that is what I prefer in that size range.
Another consideration is whether or not you use speedloaders. If you do, make sure the speedoader works with the grips. Also, make sure the spent cases eject cleanly and don't hang up on the grips. That was one gripe I had with the stock Hogues that S&W puts on their 686s, they always grabbed one case. I also don't like finger grooves (the 642 boot grips are the exception).
And that is another consideration: finger grooves or no finger grooves. If you like to grip the gun as high up on the grip frame as possible, you may find that the finger grooves are not in the right location. So you may prefer smooth stocks in that regard.
You could go on eBay and buy some well worn stocks that you think you may like on the cheap. $10 for grips you don't like isn't a big deal. And if you like them, you can buy some just like them that are in better shape later.
Hope this helps!