Are you hoping to get the 7,000 - 8,000 miles in a single day of flying? That's going to be a bit of a challenge given that there are only about 18 hours one could possibly be flying.

If your program is specifically Delta (as mentioned in your profile) and if you can handle two separate days (no overnights away), I would think about the SFO - JAX midweek deal ($187 on NW, $196 on DL) might merit consideration.

Are you willing to pay for first class?