Here are two of the best:
Progressive 440 IAS You need part number #440-4214 & comes in four styles. The spring rate on these is 120lb to 170lb. If you don't weigh much, it appears #440-4235 is rated a bit lower & fits our bike. You can get the polished aluminum for US$399. If you want to save a few bucks, even the 412 Series are a worthy upgrade from stock.
Work's Street Trackers The chrome dual rate shock with threaded pre-load will set you back US$529, but if you tell him your an AMA member, you get 10% off. Work's cost more, but they build the shock for your weight & riding style. If you don't like how they feel, you got 30 days to send them back & have spring & valving adjustments done.
Both are fully rebuildable.
I've been deciding for awhile myself and finally settled on the Work's, mainly because I prefer the look of the shock & know I can get any adjustments need after I beat them up at the GA Rally.
BTW: the Work's fork springs are dual-rate (actually two separate springs) & seem like a good match, but they are 2X the cost of Progressive's; so I'll probably just go with the Progressives up front.
