Here's my take on my 450/550 setup: It's fine for a street driven car, definitely firm, but not going to kill you. I have no reservations about going on a road trip, and no complaints during my daily commute. In the last auto-x I felt like the front was soft though... which means I'm eventually going to order 700 lb springs and get my Konis re-valved, and then I'll run 550/700. I don't trust the OTS Koni yellows beyond around 600 lbs, a friend of mine blew his rears out running 450/650.
Best thing I can recommend if you're unsure about what spring rates to buy is to take a ride with someone else that has a known setup.
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