Hiya Samaras -
First of all, let me just say that that's one heck of a machine you've picked out for yourself. I looked at a LOT of tractors before I decided on a Grand L.
If you have any doubts at all about whether that's the exact right model, feel free to ask for advice based on your intended uses. There is a LOT of experience on this site ... a REAL lot.
For instance, bear in mind that the 3830 isn't just an extra 4HP; it's a slightly bigger tractor. Of course you can't get a cab in a 3830, god only knows why. And if you're getting a cab; even though I "bleed orange", I'd have to urge you to at least look at the JD Twenty series.
I feel compelled to give you your due credit though, so assuming the 3430HST is "the" machine, here's what I'd advise you to do. Figure out EXACTLY what you want on the tractor - tires, type of bucket, cutting edge, block heater, Quick Attach, the works; then contact 3, 4 or 5 dealers, tell them EXACTLY what you want, and ask them to give you their one-time, one shot at it, BEST price, period. Tell them you're not going to haggle with them, that you know what you want, and you're going to buy it from whoever makes the best offer. You don't have to say you're going to go with the lowest price, because you might not. Other factors might well come into play. Just get them to sharpen their pencils, and then don't beat them up.
There's a really good thread that you might want to read called "Dealers on this site and cheap customers". It's ALL about haggling; how to, when to, and when not to. Good stuff.
Lastly, I'd strongly recommend getting the 723 loader; might as well, the machine can handle it no sweat.
Good luck, John