Let's get this out of the way now; I'm a self-confessed Philistine. If you want collector value, get something with the correct grips, but take them off when you shoot it. Substitute a set of the readily-available rubber grips on your range days and your hands will thank you. The later S&W target grips are beautiful to look at, they fill the hand nicely and will be reasonably comfortable for most people shooting .38 Specials, but they are too wide at the top for most of us. The combination of the wide wooden grip and the trademark hump under the hammer, designed to keep the gun from rolling back in your hand under recoil, is a lot like getting rapped in the web of your thumb, HARD, with a wooden mallet under heavy recoil. It's not my idea of fun. My personal favorite is the Decellerator series from Pachmeyer. If you just can't bear the sight of tacky rubber on your collector gun, look for a set of the old Herrett Shooting Star wood grips. They have a narrower profile at top and bottom, but still look good. I haven't tried the Jerry Miculek grips that the Custom Shop uses on some of the new guns, but Brownell's sells them and lots of people swear by them. Another benefit is that you won't need to worry about damaging a nice set of original grips at the range.
JGR