from the pics
he would go a bit further in then just the bald spots on your temple angles
wanting to adj the temple points as well as the frontal hairline
i'd say the recipient area covered would be 50-55cm2
to blend in naturally with what looks like a nice thick wall of hair behind what will be the new hairline he would probably attempt to implamt 65-70 in the front, 60-65 directly behind that, and 50-55 further in.
i think it would come out x-lent meaning your loss (minimal at temple angles) and hair characteristics (thick and wavy) and skin type (dark) were made for a hairline restoration like this
BUT this all depends on your donor hair, scalp laxity and if rahal would want to spend 3500 grafts on a 20 year old to lower his hairline when you might have a very good chance of losing the rest behind it.
that's why other factors come into play, other than hair available
age
future loss
family history
propecia use
it's worth a consult with him
he won't steer you wrong
his website is also FULL of hairlines and hair types like yours with spectacular results
though i do believe these patients were much older than you
so be aware