I haven't gotten as far as suspension yet, but I would like to at some point. Availablility of Wagon-specific suspension is definately less on the local market, I think, but there are sources for take-off JDM STi Wagon stuff out there. I just can't justify the expense yet (I seem to recall that it would be ~$1000 to do it right).
Here's that crazy long post concerning my L's current state:
http://www.seccs.org/forums/viewtopic.php?t=1717