So, I need a beater/project and a reasonably sized bike to teach my lady how to ride. In a past life I was an outboard mechanic, and I've never owned a two stroke bike...so I'd like to make this my first. I've narrowed it down to the DT175 and 250. It'll likely serve as a learner bike for my better half, but will eventually turn into either something that resembles a dirt tracker or maybe even something more street oriented (depending on where I live in the next couple of years). Anyway, since I've never even seen one of these bikes...are there any significant differences between these two models? Seat height, frame size, weight, engine/drivetrain issues?