Stonker if your thinking of buying a KTM just go ahead and do it, the SMT is the most fun bike I've had for a long, long time!
At the risk of repeating myself, I dunno if you saw my original post when I first bought the bike, this explains more how I arrived at choosing the SMT :-
http://www.ukgser.com/forums/showthread.php?t=274942
Everything I said still stands, I've got almost 5,500 miles on it now and apart from a healthy appetite for fuel and tyres ( which is mainly the fault of my right hand!
) I can't fault the bike.
Get a test ride on the ADV and SMT, depending what you want from your riding ( do you ever go off road? ) one of those bikes will fit the bill, the SMT handles better and has much better brakes.
The next service at 9,000 miles is the valve clearance check, I'm told this will be around the £300 mark, which is ok to keep the warranty up.
When I bought the bike I asked about extending the warranty for another 2 years and I was told this would cost me about £230 and I don't need to pay for it until I'm in the 23rd month of the original 2 yrs warranty so it doesn't seem a bad deal to me.
Let us know what you decide