I've been trying some different type grips PM Contour etc. and found one I've settled on. I use to have Kuryakyn ISO's but with my Carpel Tunnel the diameter was starting to bug me. I picked up some of the new Kinetic Grips and really like them. They are a smaller diameter than ISO's but they've got the cushioney rubber I've come to love with ISO's to take out vibration. Found them at good $20 discount on eBay. I highly recommend them!

http://www.kuryakyn.com/Products/4316/Kinetic-Grips