If you weight 304# you might find it a bit soft, but that can be fixed by adjusting in a little more preload to the springs. On the showroom floor the mower won't bounce up and down like a car, because compared to a car it's very light so you're pushing against the springs with little vehicle weight to help. Out in the field however, at speed, you'd find the suspension well compliant.
It sounds like you've made your mind up. No problem. I'm sure you'll do fine with whatever you buy, but just in case someone else comes along through a Google search I thought they should get a rebuttal to the idea of full ZTR suspension being a gimmick. I drove a Simplicity Champion on my dealer's property for quite a awhile before I eliminated it due to my slopes, but that was a tough thing to do because the suspension worked beautifully and the ride was superb. Although my present suspension seat works pretty well, I would have enjoyed mowing far more on that thing or on a Ferris. If I could own one, I would.