Sorry, forgot to respond to your pm...
I really like my 1648. I've got around 215 hrs on her now and she's been perfect. But, I could definitely use another 10 HP for some of my chores. The loader is pretty strong. The cab is comfortable. The tractor as a whole seems to be as high quality as any of the other brands, if not better.
But for you it will all come down to uses & needs. Using my stump grinder, there are times when I use every available ounce of HP, so the 1742 probably wouldn't cut it (for me).
Also, the DL130 loader is quite a bit stronger than the DL120...