Dave,
Stay the F away from a liter bike for the track. almost every single person that I know with a liter bike has gotten on something smaller (600 or 750) and gone faster. a literbike at the track in the hands of anyone who isn't an expert level racer, is just a speedy ticket to Highside City. get a 600 or what might be the ultimate track day bike, a late model GSXR-750. parts are cheap and plentiful if you crash. there's a heck of a learning curve to transition from a twin to an L-4, but after you figure out that it's all throttle control, throttle control, throttle control, it's a lot of fun.
if you want to stay in the freakshow, you really can't go wrong with a Triumph 675 which is really the best of both worlds, plenty of torque at 7k+ rpm with a big hit of horsepower up top. it won't be any cheaper to go boom on than your Aprillia, though.
good luck,
Lance
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