I have looked at my drafts last season and this is what I had:
Season 8:
1: Star 4B, Pot 5. Had $3416 MVP (9)
2: Star 4? Pot?. Had $3439 Superstar (8)
3: Star 3? Pot? Had $2477 Starter (4)
Season 7:
1: Star 5A-, Pot 4. Had $3743 Perennial Allstar (7)
2: Star 5A-, Pot 3. Had $3847 Star (5)
3: Star 3?, Pot?. Had $2833 Allstar (6)
My guess is something like this:
For stars in $:
5: >3700
4: 2800-3700
3: 2300-2800
2: 1900-2300
1: <1900
Potential:
5: 9-11
4: 7-8
3: 5-6
2: 3-4
1:<3
But it is pretty wild guesses. If my information is pretty close to truth I would like 4 or 5 stars and at least 3 in potential but 2 could actually be quite ok. Much rather 4 star and 2 potential than 3 star and 5 potential if considering training possibilities. But I would still rather pick a 5 potential player as people would overpay for such player.
Comparing 18 and 19 year old drafts are also tricky. I would require pretty much to prefer a 19 year old player. I would rather have a 4 star and 2 potential player than a 4 star and 5 potential player that is 19 if I had to chose for my own training purposes. But again people will pay a lot to have a 5 potential player even with rather crap current capacity and a 2 potential player is not going to be especially good anyway so of such reason I would go with the 19 year old.