Good lord! $5 for 20mg adderall?! Here you can get em from the high school kids for like $3 a pill, the 30mg XR's too. As far as focalin goes is not as good as amps. Its more like ritalin. It will keep you awake, but its more of a jittery unfocused speed without much euphoria.
I have compared it to amp before. For me it comes somewhat close. Slightly less euphoria, just as focused, about half the peak. The comedown is way worse IMHO, however you can sleep that night. I don't like methylphenidate at all just for the record.