Good floorstander
If you want "good" floorstander, consider spending all or most of your budget on the fronts. Most floorstander in the few hundred range will produce sloppy, boomy base, but there are a few exceptions.
For example, av123.com will be releasing a floorstander version of their Onix X-LS speakers for $300/pair and a dual mid, powered woofer version is in the works for $600/pair.