I bought a set of the Multi-fit grips from my local HD dealer. Other than having to remount the left grip the next day cuz I didn't get enough of the adhesive on it I love 'em. Pretty reasonable price too ($65 I think) considering they were from a HD dealer.
I bought the Avon air cushioned grips and in my opinion I think they are great. I got the black anodized grips and the quality is great and haven't seen any of their grips with plastic on them.
Check out the grips at http://coolsac.com/ --- they are larger diameter than stock and the padding is very comfortable --- lots of choices from plain to a variety of designs in the leather. I had a set of plain leather wrapped on my previous bike --- very comfortable and no more finger numbness --- I plan to upgrade my current grips soon. paul
I swapped out the Avons (the ones that look like the PM Renthals) for a set of black Isos on the Night Train and I'm amazed at the difference. The Iso Grips are far more comfortable.