v8vso,
Welcome to TBN.
I would defintely go HST. Gears are a hassle. HST gives you much better finite control & is MUCH easier to use especially for your better half. If you want you can crawl at 1/2 an inch per second with HST & you don't have to think about what gear you are in or changing gears. Also, for front loader work you can't beat it.
As for the L3430HST vs. L3400 I would go for all the tractor you can now. Sure the L3400 will do most of what you want but the L3430HST I guess can be considered the deluxe version. However, besides the better ergonomics.....seating, more operator platform room, tilt steering, etc. you are also getting the following;
- Over 1,000 lbs more lift capacity of the 3 pt. hitch (24" past lift point).
- Heavy duty front axle for more front loader capacity.
- Telescopic lower link ends on 3 pt hitch which makes connecting implements much easier.
- 700lbs more weight for overall tractor.
These are all big bonuses because you never know what you will get into in the future especially with 10 acres.
Don't let anybody try to talk you into a smaller tractor. You are talking about 1,320 ft. of driveway you want to keep up & be able to keep clear of snow. The more weight & the larger the tractor the easier & FASTER you will be able to do this. As it is, it still will take you an hour or two depending upon accumulation.
I agree with other posters remark with regard to FEL. Even if you go Grand L 3430 series tractor, 60" would make it much easier to maneuver in the woods.
You & the wife need to try both tractors out & see which tractor seems to fit better.
Good luck with whatever you finally decide & keep us posted.
Vic