I have a 58cm in the basement - so that's my reference. Although it's a Criterium, I assume the top tube heights are the same. The photo looks to have about a 3 finger width gap at the head tube which is what mine has. The top tube on mine is 32" off the ground. If you have a 30" inseam and it's a 3 hour drive ..... well it's up to you, but I would think twice.

With the sloping top tube of the Jamis - the "feeling" is gonna be different than if that top tube was straight across.
What exactly are you looking to gain moving on from the Jamis ?