Ive had a neo air for a bunch of years now and like that I can sleep on my side with it. I would say though that you really need to visit a REI or something that has lots of mats and take the time and actually lie down on all the various ones. In the REI equivelant here in canada, MEC, they tend to have open mats hanging beside each other so you can really see and feel, and lie down on, all kinds of diff mats.
I figure this is the most important thing to do, to experience them in person.

I also havent been bothered by the noise of the neoairs, although I am a bit hard of hearing in one ear, so that helps, and Ive found that the sleeping bag reduces the sound a lot (maybe take your bag with you to the store also)