I've been there, having completed a re-do of both the master bath and the kitchen a few years ago. Because of cost I opted for solid-surface material (Corian) for both.
However, if cost was no object (or I won the State lottery) I would not hesitate to place granite in the bath. The selection of colors and patterns is dazzling--and I think the bathroom is one place where you can probably splurge (because there isn't THAT much countertop, right?).
But on the other hand I would never put granite in the kitchen, and here is why. Granite is porous. It needs to be sealed (and re-sealed) at least once a year. It stains. Granite was the "in" surface a few years ago. In my (humble) opinion, it is a fad and one of those design elements that will date a kitchen remodel (along with stainless steel). My kitchen counters look like carrara marble, the backsplash is dark grey slate, the cabinets are white (with a subtle touch of grey), and the appliances are white. I'm hoping it's a look that will stand the test of time (or until my kids move me into the retirement home).