I used standard VW bushes - just didn't have the cash for the powerflex stuff and standard ARB's too ...
Both front and rear shocks are adjustable on the car - the fronts are the usual key on the top of the shock, the rears have a head u adjust with a flat head screwdriver on the bottom of the shock. Nothing like other Koni's i've seen where the rears are adjustable, but they have to be removed from the car / compressed / twist to adjust crap !!!
Try these people for the kit
http://www.motorsportworld.co.uk/Cheapest anywhere by a long way - 40mm kit is Part no. TAP408
Go for it and enjoy lift off oversteer fun