When buying Apps for the iPad, do you buy iPad apps, or iPhone apps that you can use on the iPad as well? I ask this for many reasons. iPad apps are usually more expensive than iPhone apps, for example, Angry Birds for iPhone costs $0.99, whereas Angry Birds HD for iPad costs $4.99. Don't get me wrong, I do buy iPad apps, but usually when it's on sale, rarely for $4.99. And the apps I have are usually free also. One reason to why I usually get iPhone apps, is because it's cheaper, and I make sure that they are compatible with iPad also, so I can play it on both screens. But does the app look bad when using an iPhone/iPod app on the iPad?