rear brake suggestions?

[Calvin Krug]

Well, my trusty '89 200 Quattro needs new rear brakes. Pads, rotors, 
calipers, the whole deal.  I'm probably going to get the parts from 
Blaufergnugen, but as of yet, I haven't decided which way to go.  So, 
I'm looking for thoughts from my fellow listers. There is only one 
choice for calipers, as I need the bracket.  Pads, however, I could 
use stock, or either of the two semi-metallic that Blau offers. As 
for rotors, there is stock, and grooved.  Would it be a problem 
upgrading the rear brakes to the better semi-metallic pads and 
grooved rotors if I'm not doing the fronts right now (they are still 
50% or better)?  I'm a little concerned with throwing off the brake 
bias.  When the fronts go, I plan on using the good stuff up there. 
There's no such thing as too much brakes.  All comments are welcome 
and appreciated.

Calvin Krug
-- 
Before I criticize a man, I walk a mile in his shoes. That way,
if he gets angry, he's a mile away -- and barefoot.