What about the Red Shift 468 cam? Heard nothing but good about it. It's what I plan to add this winter...

 

If it helps...

I have a Dyna Switchback 103TC, where I've installed an Andrews 57H, and then a couple of months ago, removed the 57H and installed a Woods 222, which is very similar to the Andrews 48.

The 57H was great from 3k rpm and pulled to redline. From 3k on up, there was always power up to the stock rev limiter. At lower revs, torque was a little soft. A lot of my cruising rev range is 2,500rpm - 3,200rpm, and unless I was either gunning it, or adapting to riding with higher revs, wasn't digging the lower rev range performance.

I looked at a ton of dyno charts, and was using 100 ft/lbs at 2,500rpm as my gauge. When I put in the Woods 222, the bike was A LOT smoother, and low end performance was dramatically improved. Having said that,"pull" starts to drop off around 4.500rpm and by 5k rpm it's done.

The Switchback is almost exactly 100lbs lighter than the RK. Especially because of the additional weight, the Andrews 48 / Woods 222, CR 570-2, etc., should give you a nice balance of power and rev range. I'd advise against the 57H unless you're going to increase compression, increase displacement, etc.