I'd still suggest looking at Toto. Have you tried looking for local dealers on their website? There are some Toto dealers in Idaho...and there's always mail-order. I just bought two Toto Aquias for my newest residence via mail-order and everything arrived as ordered about a week later, no probs.
Trying to get a Toto with a 14" rough-in will limit you to their models which use the Uni-Fit adapters. These are their "skirted" toilets, which look better, but also tend to cost more than their non-Unifit toilets. The Toto Vespin is the cheapest Uni-Fit toilet Toto makes (IIRC), and that with the 14" uni-fit kit will probably be a bit over your desired $300 max. That said, the advantage to Toto's skirted toilets is that the toilet's dimensions don't change regardless of if you use a 10", 12", or 14" adapter, not to mention the performance factor.
In my other residence, I have two Toto Pacificas. One has a 10" Uni-fit, while the other has a 12". This ended up happening as the result of a bathroom remodel where walls were substantially moved and rooms were combined. The Unifit system meant we could order two of the same toilets, get the same look in both bathrooms, and have them occupy the same amount of space, just had to order the extra 10" Uni-fit kit.
FWIW, the only 14" Kohlers made seem to be their Wellworth series, with the elongated being 34" deep (holy sh*t... my Aquias are elongated and are only 27" deep) while the round Wellworth 14" is 28" deep. Their prices also make the Toto Vepsin w/14" Uni-fit start to look affordable.
Overall, 14" toilets are hard to find, and are usually much more expensive than the 12" standard toilets. If you can live with the extra 2" behind the tank, by all means, buy a 12" and save yourself some $$$. Maybe throw a countertop or cabinet over the tank with the money you've saved. Just allow for access to work on the tank for repairs. A 3rd option would be to throw a tile or wood wainscoating on the back wall to help "bulk up" the wall and reduce the 2" gap that a traditional 12" rough-in toilet would leave. It'd probably still be cheaper than a 14" toilet AND could add a rather nice decorative touch.