[Nick D.]

Assuming you find parts that fit, I would go the Sbk/Ohlins route.

BCM swapped out my springs and valving on both the OEM forks and shock and Chris (old parts person) said I would be surprised at how "plush" the ride would be, especially over train tracks.

I definitely noticed an improvement in the ride but I would never call my bike plush. The biggest improvement I noticed was the forks of course and the rear ride height, but the rear really doesn't feel much different from OEM. And I wouldn't call it cheap either. For what it cost to go through all of that I could have thrown another couple of hundred into the pot and scored an Ohlins in the rear and Sbk forks up front.
An Ohlins (or whatever) is the way to go out back. When I re-did the suspension on my M900 I had BCM re-do the forks and I bought an Ohlins out back. HUGE difference. Maybe it's the Ohlins, maybe its the different type of suspension, maybe both, but I like to think the Ohlins is a big part of the difference.