Hi mate, not sure about your question re dropping it all but if you speak to one of the scooby specialists around I'm sure they'll be able to help you out. I use martin & dave in sheffield @ sheff subaru service, they've answered many a daft question when I've rung up.
As for bushes I'd just go for oem spec if you don't want the harshness of polyurethane ones, try www.importcarparts.co.uk for them, if you can't see what you want give them a bell as they'll probably have it in