They are a great dealer! I, too have benefited greatly from this site!
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I read an earlier thread on 4300 vs 4310 and if I remember correctly most liked the ehydro a little better.
I will try to cover the differences, and I don't mean to sound like I think you no nothing, but figure that there is little info out there on the 4300 anymore. The 4300 at Tristate is a Reverser. That is different from a Hydro. There is a difference in the Hydro vs. eHydro, although there are many happy 4300 owners. The reverser is a manual transmission. You use a clutch to shift gears but can go from forward to reverse in any gear just by flipping a lever. The eReverser is pretty much the same, but is electronically controlled. which allows adjustment in the smoothness of those changes.
There are lots of owners who would rather have a reverser, it is more efficient on getting power to the pto and wheels, and is a prooven reliable design. It does still have a clutch, although with Deere's you do not have to clutch to reverse.
300 miles is a considerable way to go. If you do decide to go that route, you will have a great dealer, and they are good about sending out little things if you need them, so you aren't stuck always bringing the tractor to them.
Both machines you are considering have advantages. Now, if you aren't confused enough, you can also look at machines on
MachineFinder to see if there any similar deals near you.