As usual on these forums Ray, you will get flooded with answers trying to convince you to spend vast amounts even if you state up front you aren't interested in spending a fortune. Yes, there are better suspension components on the market, just like there are better or just more expensive parts for the rest of the bike. Those who don't have unlimited budgets will need to ignore those who either do or want you to think they do, and go with a cost/benefit answer. If you can get a decent price for the H-D "Premium" hand adjustable shocks (look for take-offs from the guys bashing them, since they are no good they should be willing to give them to you), they will be an improvement over the stock air shocks. Not the best out there, just better than what you have now. There are other choices that also fit into that area between the H-D "Premiums" and the ultra high priced stuff. Works Performance is one name that comes to mind, you could also talk to Jim (hd-dude) about the Suspension Technologies shocks that have gotten good reviews around here.
Jerry