Have a look at these posts about different airrides w.hdforums.com/forum/frame-suspension-front-end-56/
Click on "air suspension"
And what I have on mine. http://www.shotgunshock.com/
Check the comparison chart
I've been running Arnotts for around 12 mths now. The main reason I went this way was to stop the bottoming out with two up. They are a pretty cool shock. I'm 95kg and I pump them to a bit over half, if two up, then right up almost. I set the dampers at around half way, really hard to get that right. Anyway I'm really happy with them and when slammed, they look pretty impressive as well!!