I recently lowered and I know I need to get an alignment. Will I need just the front end, or front and rear?

 

Front and rear. The rear only has a toe adjustment (read: no camber) from the factory. The front has a slight amount of camber adjustment and has toe adjustment. Personally, I'm an advocate of the "camber doesn't matter" argument. As long as the cross-camber is even (left camber = right camber within 0.25 degrees), you won't have a pull, and provided you don't have a crazy amount of negative camber you won't see much premature tire wear (I ran -3.0 degrees on all four corners with negligible tire wear). Toe, however, will destroy your tires in a few thousand miles.

So basically get a four-wheel alignment, and if you don't mind the looks of negative camber, smile and say "just adjust the toe" when the alignment tech tells you he can't align your car to factory specs