Fan u r new to harleys, in the harley world since eternity the owners of harleys have put different air filters, exhausts and adjusted either the carbaurettor jets or the mapping of the fuel injection system in order to realise the stifled power from within the motors, that goes for the bottom of the range sportster883 to the top of the range cvo ultra. Welcome to the harley world my friend.
The springers dont suffer so much from the heat issues as the touring bikes do, they havnt suffered the crank run out problem either due to the balanced crank which the other models dont have, the oil leaking problems should be solved with the 09 bikes, ok some of the 09 bikes have suffered from colour peeling off of the engines but i dont remember anybody reporting a springer do this. If ur hooked on the springer go for it, anything can be fixed. If u look on other hd forums u might find more specific info on any problems the fat boy might have.
Best of luck which ever u chose.
greetz from switzerland,
by the way we will be having our 1st official european get-to-gether at the 3rd european festival near St Tropez in France 7-10 may 2009, have a look in the events section u wil find more details