The iPad is ideal for reading comics.
Just perfect. Buy it, and enjoy . . . you will not be sorry. It is true that other companies have tablets of one kind or another "in the works" -- but at this point, Apple is far, far ahead. Microsoft talked up "Tablet PCs" for a decade, and never introduced a one that you'd want to use. You wouldn't want to read a comic book on a Kindle, or a Nook, or a Samsung Tab, or whatever it is that Blackberry is doing.
Sure, things will be better/cheaper six months from now; that's always true. But the iPad is fantastic right now. My Dad, who's 70 and hates computers loves his iPad. It just works.