id get the 250f. that 450s out dated, not because its older than the 250f, but because its got the old 250 2smoke frame and plastic and looks stupid imo.
but if you get the 250f, and if you ever need to replace the cylinder (like if you blow it up or something) id get a 05 cylinder because the 04s had real thin sleeves..
my friend is the same way. he had 3 kawi 250fs, and one of his sponcers gave him a brand new 450 and he absolutly hates it.. he'd rather run one of his 250fs in the 450 classes than run the 450...
ya, ive rode a 450 and i pretty much hated it. its horrible on tight tracks......you cant open it up enough. the 250, well you would be able to use more of its potential no matter where you rode other than straight aways haha cuz then well anybody can hammer on the throttle and shift gears
man, you should try a 4 stroke, especially the higher sized engines.....they have like a powerband but you also have low end power.....pretty crazy and lots of fun