Suspension?
 

Background - 2002 Bugeye WRX with Eibach ARB f & r and powerflex droplinks (rear only as the fronts are the metal ball joint type as std).

My rear left shock has recently started to knock (I think it's the shock nothing else is loose) I was going to get a set of eibach springs and a whiteline/perrin ALK. Now I thought I'd use the knocking strut as an excuse to replace the shocks all round with a sportier set up. I used to run Koni T/A shocks on my MKII golf with eibach springs and this was excellent, however these appear to only be available as inserts for the impreza - so are they any good?

The other options appears to be either KYB shocks (I'd probably get the AGX unless people think the non adjustable SRs are as good) or Bilstein Sprint dampers (but don't appear to be available for the WRX).

Or as an outside bet the Subaru sports package springs and struts - anybody know how much this lowers the car by?

I could try to get a set of coilovers but don't really want the hassle/expense.
Any ideas?