Morse, Welcome.....
Don't take my tone the wrong way...I'm just rambling to give you something to think about. I'm biased to the TLB /forums/images/graemlins/smile.gif
So I would think you would have a real lawn mower to mow your lawn once it's installed. I've been through it with three machines now.....buy a real lawn mower, then get a TLB if you want to take care of the construction end. Sounds like you've got a lot more to do than a
B7800 would be appropriate for, IMO. Sure you could struggle through it for weeks with a smaller machine, but it won't be a productive use of your time. Getting the house done is key, both emotionally for you and your family and the bank. Tractors the size you'll need aren't good "mowers" per se. They are just too big and heavy to mow a private lawn (large fields of grass and industrial and school yards are another story). Again this is my opinion after owning a BX,
L3830 and now a
L39. I love my lawns and a tractor is not the right tool in my mind for a nice finish. A BX is a great mower, but it's too small for what you need to do. 3030 would be border line, but again I think it's too small for the projects you describe. The long term soil compaction is not what you're looking for. It promotes weeds and crab grass.
I think it comes down to, do you want something that is OK at everything under the sun, or do you want one machine that's really good ditching, roads, drainage maintenance, snow blowing, etc. Then you get a lawn mower to do what they're designed to do, mow lawns. Now that I have a lawn mower, I'd never want to go back to mowing with a tractor again. Unless it was a huge expanse of non-home surrounding grass.
I'd take a look at the JD110 or the K L-39. There is no comparison between a real TLB and a CUT when it comes to construction. That's what they're made for.