I think you can flip a coin on this decision.
I use a
B2910, which is the same basic tractor as the
B7800, but the
B2910 is considered the upgraded version, it comes standard with lots of little convenience items and some major extras as well, but all that said, it is essentially the same tractor mechanically. It is a great machine.
I also have a New Holland TC24D in the garage and find that to be an amazing tractor. It is the little brother version of the TC29. The TC29 is very similar to the
B2910, in that the TC29 has lots of added features that the TC30 does not have.
The TC30 is very similar in features to the
B7800, both are considered value tractors, both are strong workhorses and excellent basic machines.
Given that you have 6 acres, you might consider stepping down one size machine and buying a tractor with more features for slightly less money??? Just a thought. But for slightly less, you could go to a 24hp
B2410 (again a deluxe full featured tractor) or a NH TC24DA and get more ergonomics than you'd find on either the
B7800 or TC30. Or, in the same size class machine, you could go to the B2610, which is a basic version of the
B2410. On 6 acres I don't think you wouild find yourself underpowered at 24hp with the tasks you listed.
The big advantage to steppind down to a TC24 from a TC30 is that the TC24 uses the curved arm loader from NH and that is an excellent loader. I use a 12LA loader on my TC24 with a 54" bucket and I also use a LA402 loader with a 60" bucket on the
B2910, I strongly prefer using the TC24, despite it slightly lower capacity and size becuase the visibility is about 100% better, making loader work faster. The
B7800/
B2910 use the LA402 square arm loader, both also have long flat rectangular hoods. The visibility forward is lacking and you really don't realize how much of a handicap it is until you have 2 tractors to compare the vast differences. If loader work is a priority, then seriously consider NH's loader as a significant advantage. If it is not a priority, then the advantage is minimized.
While an expensive machine, the TC29 also uses this advanced curved arm loader design with greater capacity, but that might be a machine that is above your budget, it will certainly cost more than a TC30 with the old style squared loader.