I've got a pair of Duke 2 black wheels + forks + complete front brake Brembo master cylinder/hose/Brembo caliper + triple clamps for £425. Wheels include both discs (320mm Brembo front), sprocket carrier + cush drive rubbers. Tyres are shot, but I've got a half decent pair to chuck in. Also includes the front spindle (minus the spindle nut - not expensive from KTM), and handlebar clamps (minus the rubber bushes - again not expensive from KTM).
The complete front end will bolt straight on to your 04 Berg, and the rear wheel is a straight fit. That way you get the shorter/stiffer front suspension and blinding brakes without messing with your standard enduro/mx set up. Get yourself an SM spec shock - or get yours done - and you'll be fully SM'd up. Way better than chucking a pair of wheels on an enduro with stock brakes/suspension etc. Ideal solution if you're looking to convert your bike to Supermoto on a permanent basis - with the option of selling on your MX/enduro set up and get most (if not all) your money back!