If you don't want to get a sub, you should definitely get floorstanding, unless you're okay with lacking a bit of bass. My Rega R3s were $800, and are perfect for the office/small room, designed to sound good despite being flush against a wall, and woofers on the side. Similar design is the Mordaunt Short Avant 908i, available for $650-$700 right now. A friend has them, and they sound amazing.
I also have Wharfedale Evo 20, which has a nice thick sound. I've used them for both the bedroom, and as side surrounds in 7.1 setup. Got 'em a few years back on eBay for under $500.