STAY AWAY from Ksport bags.
Both Timmy and I are running BC BR Coilovers with UAS bags and brackets. We both love this setup.
Only different between our bag setups is that I'm running UAS 2GS billet upper mounts where Timmy is using the standard BC upper mounts with the standard steel UAS upper adaptors.
Ride quality is fantastic, IMHO. If say better than just the BC's on their own and not much worse than stock, but sportier and more planted... Less wallowy and floaty than stock.
Follow Timmy's build thread he linked you too, it helped me a ton with my build. if you are going Elevel, I posted a how to on building and mounting the brackets for the height sensors.