I'd be inclined to change everything while getting the shocks replaced, everything is probably original and due a refresh. I'm leaning towards FSDs and Eibach Pro-kit, the Pro-kit is actually the one with the more subtle drop, only 25 - 35mm on the E92, 6-pot engine will be heavier giving a bit more of a drop.

The Koni FSD from Germany coming in at €716 and Pro-kit €154

http://www.ebay.ie/itm/KONI-Stosdampfer-FSD-Kit-BMW-3er-E90-91-92-93-Cabrio-E93-320i-335i-320d-/131535837234?hash=item1ea0259832:gWwAAOSwBahVfVPT

http://www.ebay.ie/itm/EIBACH-ProKit-Federn-35mm-BMW-3er-E92-Coupe-2006-325d-335d-i-E10-20-014-13-22-/311308743165?hash=item487b7271fd:g:v3QAAOSwECZUooK W