If you're including the counter/sinks/faucets, $1,200 is a pretty tall order for anything but bottom of the barrel. There might be an IKEA option that would get you there.
I just did an IKEA Ängsjön vanity in a spare bathroom at my place. It looks OK and is fine for what it is, but not the highest quality. But a 72" one of those (two 36" ones, really) would be about $700 plus the counter and sinks. This is the basic idea, though obviously a 72" one would be longer: