Hi
think you were wise, I got carried away and thought it would be great but really too much trouble. As for price, I am in UK so it is different, but here the 730 was around £3000 and the 830 (not available yet here!) but that will be around £6000 so, here it will be twice the price. BUT, if I am right, and I dont have a 730 but a 630, the throat on 730 is standard size, so will not be much different from your 440 size wise! Hope that helps!
PS. personally, would love a 830, as I JUST LOVE new kit!!!!! lol
PPS. exchange rate was roughly 2$ to £ so you could work out price!