The TU 250 might not be too bad for you. Here's a small test with some real-world observations -
2015 Suzuki TU250X Comparison - Motorcycle USA. It is just barely capable of the speeds you require.
The big (650) enduro is a different animal. Some like the tall height and dirt bike riding position, others not so much.
From what you have said, I think something more along the lines of the TU might be right for you.