The 300 KTM is very low maintainence except for the electric starter. It gets dirty if you use it or not.
The 350 KTM is incredible. I assume you are looking at the 350 EXC/XCW. Nice power, perfect trans ratios, turns great. KTM copied a lot from the 300's for this bike. A little rev'y for me, so I got the 500.
"Dad, can I get a motorcycle when I grow up?"
"Son, you can't do both"