The Snell recommendation sounds like a good one, haven't heard the Zephyrs, but know they're highly thought of by some well informed 'philes. With smaller speakers (pretty much the only way to go w/ your room size), good stands are important. Not sure what sonic attributes you're after, but would agree w/EWHA that you'll need to upgrade the front end and your amplification to get a good idea of what your speakers are capable of. I saw a pair of Spendor sp1's go for $500 on this site a couple of weeks ago. They don't come up often (for good reason). Usually these are the last things to go when a person who owns them falls prey to the dreaded (seldom dormant) upgrade disease. You'll have to spend a lot of bucks before they become the weak link in your system.
Good Luck-
Good Luck-