If its a left over 04, brand new, you might be able to talk him down 1000.00 or so..but not too much more than that, since its still technically brand new..Alot of times, if you have a trade in, they may knock the price down alittle bit more, depending on the value of it!
I got my 2000 Kat 750 for 3995.00 plus tax, etc. with 7500 miles on her, showroom condition, about 4 months ago or so....so that gives you alittle comparison to go by.
Good luck, let us know how you make out. Call around as well, you can alot of times, find Kats that 1 owners have traded in, with low miles, like mine, for alot less money..many people use Kats to start out on, then trade them in after a year or 2.