Giving some serious thought to either the Equinox AV (3 shelf) or Optimum AVFF3 for a 50" plasma, centre speaker, amp etc etc. The only thing that concerns me about the AV is the fact that the top shelf is an add-on module - can anyone in the know say how stable this is? Against "nudges" and so on - don't really want an expensive TV crashing to the floor obviously. Cheers! P.S. Or am I completely off-course for a decent glass stand system? Would consider other alternatives.