Wow, it sounds like you've gotten *so* many responses, from all sorts of directions.
My daughter was diagnosed with ADHD when she was in 4th grade. We tried all sorts of medications, some dietary changes, schedule changes, etc...
She is most definitely one of those kids that absolutely requires medication. Adderall also didn't work very well for her. Her BMI dropped significantly (and she was already thin), her behavior got worse (she got very nasty with everyone) and eventually turned pretty listless. She was on the low end of medication for her weight, which is where we tend to keep her in general because we want to reduce the effect of side effects.
We've worked *very* closely with her doctor, and with her - we listen closely to her and include her in the discussions. (Which might be more difficult at 7 - but my daughter's now 13).
She's now on a twice daily regimen of Strattera (once daily high dose doesn't work for her, staggered dose twice daily works *perfect*) plus a small dose of Metadate.
Strattera is *not* 100% equivalent to Ritalin, Adderall, or any of the amphetamine based medications. And in a child that has combined type ADHD (like my daughter), she needed both types of medication. Strattera works awesome in controlling the inattentive type aspects. But did next to nothing in controlling the hyperactive aspects.
But you're right. No this is a very individualized journey your family is about to undertake and you're about to get a lot of advice and a lot of it is going to be conflicting. Thankfully there are resources out there to help you through. Take a look at http://www.chadd.org to get started.