Martin vs. Wash looks like the better matchup although both are tough. The Vikings are actually one of the top defenses against the run this year so far.
I have a similar problem. However I'm hearing news that LeShoure isn't even 100%. However --- Stafford isn't 100% either so they might lean on the running game.
LeShoure is higher risk / reward. I feel like Martin is going to give you 8 points for sure.