Its not really you're size that decides if you get a 2t or a 4t, it's what you're going to be doing with the bike. If you're going to be competively racing then I would say get a 250F, but if you're going to be woods riding and do a little bit of racing, a 2 stroke or a 4 stroke are bothe good. 2 strokes are supposeed o be easier to ride, but I rode a YZ85 the other day and I didn't think that it was hard to ride (Other than the HUGE hit) I just thought it was harder to go fast on. As for the 4t maintenence, there is changing the oil which is easy, valve checking, not so easy and some other stuff.