I like the Avons. The Kuryakyn Isos are pretty nice as well.
I put the H-D branded "Get-a-grips" on my Heritage, and I now have them on my Electra Glide. I prefer them over the Avons I was using before. They are soft enough to be comfortable, but not as spongy as the Avons. They also have a tapered shape that is more comfortable than just straight cylinder.
You probably need a different one for the TBW, but here is what they look like. They also come in two different sizes.