I'd probably head to Cheeseburger in Paradise by the Polaris Mall (it's on Sancus).
It's a fun place, although it's a little loud (music) if you're trying to have a conversation. It's a fun place to meet friends for drinks.
We also like Max and Erma's -- it's a fairly consistently good place. They've got several burger options.
If you've got a little more time, I'd head downtown to Thurman's Cafe! Great burgers. As my husband says "not a first date kind of place as you'll get all messy!"