In my mock drafting maddness, Its a near must to spend either the 1st or 2nd on CB. You need luck for a starter level to "fall" to the 3rd. Just going off mocks it follows like this
1st- DT or CB. Wildcard LB or QB
2nd- CB or DL. Wildcard WR, Safety, OT, or OG
3rd- D/Oline Wildcard TE, DB
4th- OL, DT, DE. Wildcard Safety, LB
5th- LB,C,WR Wildcard DL, TE
About 98.5% of the time you better follow this, it gos along with value too.