No question about doing it. I've got H&R's and think the stance is pretty much where i wanted it, think its a 30mm drop and the springs cost about £200 delivered (or there about’s) and another £100 for fitting then tracking.
Ride wise I'd say its a bit rougher and crashy but I prefer it like that, handling wise i got a slight bit improvement but roll is still noticeable.
One thing I would suggest it to do the walk kit at the same time or S3 bush kit, you'll be getting a bit of handling improvement form them combined.
If your after massive handling gains you'll be wasting your time with springs, go the full whack and get some coil-overs and uprated ARB's.
Luke.