For your reference, I'm just finishing up training a MVP SF. I figure I have 1-4 more skill ups until he caps based off the potential formulas.
The biggest decisions are how much rebounding and jump range you want to add. I saw Ciro Semeraro (11927136), a well developed MVP Small Forward on the TL this week who sold for $4.64M. He is 24 and pretty close to finished. He was a bit higher on the scoring side primaries and driving, where I went higher on the JR and OD and ID and that increased my salaries.
Their stat lines are pretty similar Ciro .416, .259 and Hernan .408, .257 from 3. Hernan is a little higher in rebounding (1 level=~2/game) and Hernan is more naturally aggressive.
At the end, he will probably be around 30pts in OD+ID and capped by the end of this season or early next season. With a HOF or ATG, you can probably add more points in passing or pick one skill to go to a very high level.