The 700 Raptor has more low end torque because they are fuel injected. The older 660's have carbs. Makes a huge difference in the power band, most notably on the low end.
The Suzuki 450's claim to fame is it comes out stock with the wide front end, that the Yamaha and Honda require an aftermarket front end to match inch for inch. And a wider front end makes a big difference in a lot of situations. I haven't ridden the new LTR's, but Ive heard a lot of good things.
The suspension on the 660 raptors is inferior to the 450's, which come from the factory with 'racing tuned' suspension (adjustable shocks with external reservoirs, etc). So I definitely wouldn't consider that an advantage for the 660. And, how high you sit on the quad is almost completely irrelevant to suspension travel. All it does is raise the center of gravity, which of course makes the quad (and yourself) less stable. Stability on a quad is VERY important, especially if you are into catching air.
Realistically speaking, the stupidly simple Honda 400EX is enough quad for *most* people. Sure, my 450 could dust a 400EX day or night, anywhere, any time. But most people dont need or even want a quad that is most happy doing 80+mph like mine. A 400EX has a decent amount of torque and cant put you in a lot of trouble very quickly if you dont know what you are doing. If you dont know what you are doing, a strong 450 will simply kill your ass. My 450 gave me torn knee ligaments, and 3 broken ribs... and Im an experienced rider. I highly recommend riding some of these different quads, and being realistic about what you want out of one, and your riding skill level, before deciding exactly which one is right for you.