There are a few people on here that have used H&R springs with no problems on the stock adjustable dampers. And as for the steering, from what I've seen on here, people with the DHP/VSS generally don't seem to be having the steering vibration issue that is plaguing many of the cars.
Here is a thread asking the same question:
http://www.f30post.com/forums/showthread.php?t=758724