What I'd sell you for is the Riccar Brilliance (R30 models) or the Maytag M1200..
We equip our newly redesigned tandems with the soft sweep bare floor tool so you automatically have the best carpet/rug cleaning performance and great bare-floor performance.
Check and see if you have a Riccar/Simplicity 30day dealer in your area. You are always guaranteed your money back if you don't like the machines.
If you went with the Riccar Brilliance R30, the Simplicity S30 or the Maytag M1200, you'd be amazed at what you'd pick up.
For the price, two Maytag M1200's would be perfect. They are $699 each, and you'd have one for each floor. After that, I'd suggest looking for a rebuilt Rainbow with the SuperMop or some form of wet pickup head for your bare floors. You'd have all of your surfaces covered.
The other suggestion, since you have central vacuum already, is to get a water/air separator that way you would be able to use your existing equipment as well, then you could do the wet pickup on the bare floors.
As far as my experience, I have yet to see a machine clean better than the tandem air machines from Tacony.
Just my $.02.