I have a fridge (a big dorm fridge) for lagering, only because it was free. If I were buying, I'd get a freezer. Trust me, you will ALWAYS have something in it, you won't be using it as a regular fridge or freezer. You'll either be lagering, or you'll be using it to keep temps in the mid-60°s for your ales, or cold-conditioning something... it'll never *not* have at least one carboy in it...
I'm actually thinking about replacing my little dorm fridge, I just know that it's MUCH less efficient than a chest freezer (it seems to run constantly).