2005 Kawasaki KX250F vs. 2006 Kawasaki KX250F

my dad is wanting a kawasaki or suzuki 250f soon( after he buys my mom new bedroom furniture ;) ) ive been reading alot about the differences between the 05' and 06' kx250f, and my dad was wanting a bike anywhere between 04'-06'. what are the main differences between these bikes since kawasaki and suzuki severed their company bond for the 06' and up 250f's and 450f's? are they still together for the 250 smokers? in your opinion, what will be the best 250f for 06'? by the way, my dad is ( youve all seen this) 6' even, 185lbs., and 31 y/o. he owned a kawi 175 smoker when he was 14 y/o, and that was his last bike( till this summer ;) :aj: ). he can ride my 00' kx 125 around at TNT fine. thanx for any info. regarding my questions.

thanx, so a pc water pump cover will solve overheating? in the cycle trader, its being sold by a cycle gear employee) theirs a 04' rmz 250 with a pc water pump cover, drd exhaust, race tech suspension, and custom graphics for $3100 obo. itll probably be sold be the time we get a bike, i just wanted to relate this bike.