And just so's nobody is confused...
The closest Red Robin is the far side of Boston, but the ones I went to when in CA definitely had the killer fries. I should ask someone to send me a jar of the seasoning they have at the tables. There is of course a place here in town (Draught Pick Pub) which has what they call "Irish Nachos", which are criss-cut fries in spicy seasoned salt topped with taco meat, cheese, jalapenos, guac, and sour cream. Yummy.
As far as burgers? At RR, either the Bleu Ribbon or the Royal Red Robin Burger. Then there's In-N-Out, double-double with grilled onions and spread only.
And for back home goodness, Blake's Lotaburger. MUST. GET. GREEN. CHILES.
For greasy gut-bomb goodness, nothing beats Sonic's Supersonic Cheeseburger with an order of Tots and "fry sauce". If you don't live out west, you don't know what you're missing with fry sauce.
And, if you're in the mood for expensive ones, there's always Fuddrucker's.