Suspended vs. nonsuspended TT?

I have the been looking at both used VPI TNT and Aries 'tables and Nottingham as well. I am interested in a system with great bass extension. My system is in a second floor den with suspended wooden floors. The TNT would be on a VPI stand, the others likely on a Target or homemade maple stand with some type of MDF/sand and/or air suspension device utilized.

Any suggestions on whether to go suspended or nonsuspended?

Thanks!

Matt