I have an '08 CUSE3 with the PS 31-2501 lowered monotubes (your choice of 1" or 2" inch lowering when installing; I went with 1" lower) and Works Performance 12" Steel Tracker DRS and ARS (dual rate springs + Adjustable Rate Suspension) rear shocks. I like it a lot; the PS monotubes are a HUGE improvement over the H-D suspension. I've never had the Traxxion AK-20, but many people say it's the best (although many say the PS is nearly as good for
much less $$). Also haven't had the Legends, but Midnight Rider swears by them.
According to the wrench, the H-D front lowering kit drops it 3/4", while the PS -1" is an actual inch. BTW, the PS people told me you can run the std-height kit
without the top-out springs and it will lower the bike about 3/4".
Works Perf. builds the shocks to spec based on your & BSR's weight, per cent of time riding 2-up, and bike's weight, and with ARS, it's really easy to adjust to your liking.
HTT
http://worksperformance.com/html/street.html