I dropped my ph2 dci down 40mm but it ended up looking more like 50-55 ish, and the ride is diabolical. I haven't changed the shocks and the springs are Apex, so I've kinda pissed on my own pudding there. My point being if you've got the cash for aftermarket shocks then personally I'd recommend going for my option of saving for a good set of coilovers. That was what pretty much everybody recommended to me, but I got impatient and skint so went for springs off a 172... :/
Anyway that's just me, if there's a full set of shortened shocks that's significantly cheaper than coils, I'm interested to find it myself.