Just tried Burger Bar last week and loved it. Prices are a bit steep for burgers and fries and there was a 45 min. wait on a week night, but it was a nice little treat!
Everything on the menu is completely customizable - you pick your meat, type of bun, toppings and fries. It ends up being about $12+ for your meal (depending on what you choose). They also have a really cool "burger" dessert menu (donut buns with dessert stuff on the inside) - most of those run about $5. The atmosphere is very upscale bar-like, with little TVs in each booth.
I had the Turkey Burger on Wheat with Skinny Fries and it was the tastiest turkey burger I've ever eaten! I can't remember what kind of burger the boyfriend had, but I did try some of his Zucchini Fries and wish I would have ordered them, instead of the Skinny Fries.