If I were making the choice, I'd forget the 746 and 2000 if for no other reason than their size. While you might have the space to mount them, the choices are limited. And, their basic design is getting rather long in tooth.
The 480Hx has a lot of bang for the buck, and if an amplifier is in the future, you can probably get by without one. After all, there isn't much difference between 200 and 500 watts. It does have DSP, and for an audio based one, it's good. However, it doesn't hold a candle to a decent IF based DSP.
You didn't mention the Yaesu 450, and that's a good sign; it just has too many drawbacks even when operated as a base radio. And the quirky mic gain system is real shortcoming in a mobile. (I cover this on my web site under Miniaturized Radios.)
You didn't mention the 706. While it too is a little long in tooth, it's as good as any current Yaesu mobile offering, and that includes the 450.
The venerable 7000 has a few drawbacks too, but the latest production units have long since fixed the toothing problems first seen. It still has the AGC pumping issue, but you get used to that for the most part.
What you really should do, is go to a reputable dealer, and play with all of the ones you mentioned. Ask questions, read the brochures, and think about every segment about (you personally) installing each one.
And don't forget to plow your way through all of the various menus.
Alan, KOBG
www.k0bg.com