H&R hands down.
It sounds like you are just doing springs, but if you have the extra cash I strongly, strongly recommend you get a matched spring/shock kit. I went with H&R's Sport Cup Kit (About 700-800 depending on where you order online) which offers the most aggressive drop and in my opinion the best compromise-free ride. I'm not sure if you have upgraded your shocks already, but when I pulled out my stock ones....after almost 17 years of abuse and lack of maintenance from prior owners, my shocks were leaking oil and completely blown on all 4. And if you do just do a spring without upgrading shocks? It's only a matter of time before you blow the stock ones and your ride quality will just be crap. Trust me, while I was the wiser on my 202 I went the ghetto route on a 2003 Nissan Altima 2.5L and did unknown chinese lowering springs on stock everything else and it was just horrid!
Read my forum post below to see part numbers of everything I had to purchase from the dealer to get my kit to work and to get the right stance. To help you out, here is an itemized list of everything I had to purchase for the kit on my car to work front to back, and all around.
http://www.club202.com/forums/showth...-by-mbsickness
Also, here's the most recent pics I took of my car after I installed the kit with the new drop/stance. I'll tell you with this kit my car rides like it's on rails and shockingly enough? It doesn't scrape or rub, even on questionably steep driveways.
http://s360.beta.photobucket.com/use...oquet%20Canyon
Also, no matter WHAT you do.....don't expect this to be a simple or fast job/install. It took me and two other extremely seasoned gearheads almost 12 hours to go from bone stock to full suspension installed and it was grueling, backbreaking work. We had to almost completely dismantle my whole suspension and braking system all around because the front springs were so extremely long, and yeah....just took a long a time. Glad it's done now though, the payoff is great.
P.S. you're from Woodland Hills? I'm in Lancaster, less than about 50 minutes away from you. I'm still a novice gearhead, but I've done this install once before and I know what to expect if you do it.
Let me know. Hope I helped.