I voted for the Florida corridor because it is the best and soonest prospect to have a true (electrified, separate right-of-way, 150mph or more) high-speed rail corridor up and running. Short as it is, it likely will be completed Tampa-Orlando on the presently-available money, unlike California. Florida, or Orlando to be specific, is an excellent place to expose people from other parts of the country to a working HSR line, who then can say back home "why don't we have that here?"
Tampa-Orlando is about 85 highway miles. Ashland to Franconia/Springfield in Virginia is 84 track miles on the present alignment. That might lead one to wonder if there's any good reason Virginia shouldn't be able to build a new 150+ MPH alignment from Ashland to Franconia/Springfield if Florida can make Tampa-Orlando HSR happen, although I suspect Virginia may have somewhat more challenging terrain.
I do think 85 miles may be too short to be especially useful by itself. Even at 250 MPH, a train would take about 20 minutes to cover that, not counting all of the time waiting for the train after arriving at the station early enough to not miss the train (if it's a train requiring reservations), the time going through the slow parts of the alignment into the downtown, etc, and those bits of overhead will rapidly cut into the 65 minutes a 20 minute train ride might save over 85 minutes of driving at 60 MPH. Then there's also the overhead of traveling to the part of the city where you actually wanted to go if you weren't going to the downtown, and if there are limited mass transit options, the overhead of dealing with not having brought your automobile with you.
I think successful high speed commuter rail, in order to truly enable daily commutes that would be completely impractical by either 65 MPH automobile or airplane, is going to need somewhat longer routes.
On the other hand, this segment has a lot of potential to be a useful part of a larger high speed rail network.