Agree best bet is to search but I also think your choices are limited.
Basically have the rear bumper mounted one like SMA and the clones. The only other option is roof mounted with rack.
bumper mounted is easier to get to than roof. Tire is very heavy so roof is surely a two man job. I think there is a company that makes a rear mount that has a built in lift. Other than that there's not much to it.
If you go bumper mount install it yourself. Very easy and saves you a bunch over dealer markups. Just remember to grease the hinge and keep it greased.
Hope that helps
2001 H1 Opentop
Former 03 H2 Adventure Series
http://homepage.mac.com/babiak1/