The favor/reward progression is odd.
currently:
400 - drow
1000 - vet.
1750 - BTC +2tome
2500 - Favored Soul
3000 - vet tier 2

My suggestion:
500 - drow
1000 - vet tier 1
1500 - BTC +2 tome
2000 - favored soul
2500 - BTC +3 tome
3000 - vet tier 2
3500 - BTC +4 tome