Yep, an XT 225 will be way too small. I'm 5'8 and it feels like a kids minibike when I am on one.
Good, inexpensive dualsport bike would be a DR350SE for your size. Try and find a 95 or later to get e-start.
KLR250 is about the same size as the DR350, but the suspension is softer and it will struggle to hit 65mph.
2007 WR250F (plated)