These are all pretty accurate and will hopefully help you make an informed decision, several people have contributed to the lists i have posted not just me so dw guys its not based off my experiences alone.
1 thing to note though is there is still some contention as to whether MVP is 4 or 5 balls, i've been told someone got an MVP with a 4 Ball pick and MVP with a 5 Ball pick, but regardless i still think the list is useful especially to the new guys.
The first one explains how many balls equates to each potential level. The second list is what each ball from the star rating equates to salary wise, again this is probably the roughest of the lists but it should provide you with a general range that you can use. Finally the last list just shows you what salary a player will "cap" at given a certain potential.
Now i must also add that for this kind of thing potential ISN'T EVERYTHING, it is important and if you have an early pick i would definitely suggest going for your best chance. Yet if you are looking for a player that you wan't to train up, for many of you (myself included) Allstar potential is enough, even star maybe. Well to be honest it all depends on how much training you will be doing so make a wise decision because it may be better to go for someone with 5 star rating and only 3 potential rating. At least that's my opinion. I hope you find this info useful, if anyone has anything to add to it just post it i will be glad to keep updating and changing the list :)
Potential Guide
1 Ball: 1-2 Announcer- Role Player
2 Balls: 3-4 6th Man- Starter
3 Balls: 5-6 Star- All star
4 balls: 7-8 P. All star- Superstar
5 balls: 9-11 MVP- ATG
Rough Salary Guide
5: Stars >3700
4 Stars: 2800-3700
3 Stars: 2300-2800
2 Stars: 1900-2300
1 star: <1900
Potential Salary Cap
0 Announcer: < 5k
1 Bench warmer: < 5k
2 Role player: < 9,5k
3 6th man: 11.5-13.5k
4 Starter: 21-24k
5 Star: 33-40k
6 All Star: 43-65k
7 Perennial all star: 80-100k
8 Superstar: 125-145k
9 MVP: 195-230k
10 Hall of famer: 500-900k
11 All time great: 1M+