Go to Guitar Center or an online pro-sound store and get some KRK ST-6s. These are small speakers meant for monitoring in studios and work very well as small hi-fi or HT speakers. They've gone out of production but are still available.
These speakers have excellent clarity and a natural tonal balance with smooth highs and clean bass---no "earwire" highs or booming bass. And in the right room they can do the big "3-D" imaging thing giving a stereo image with good depth and width that extends past the speakers themselves, even with a solid state amp like a Denon.
They can be found for about $200 a pair, a real bargain. I've used ST-6s in a den system while my main system has used no holds barred speakers like Altec VOTs and Model 19s, JBL Pro 3115s and Martin Logan electrostats driven by both solid state and vacuum tube amplifiers. The ST-6s do OK. Of course don't expect the dynamics and clean high output of larger speakers.
And yeah, be leery of Bose. It's instructive to note that the number of experienced audio hobbyists who favor Bose speakers is about zero.
My old HT with Altec 19s
Same system with KRKs
Same system with Altec VOTs
KRKs in current den system