Good 1st thing is the soil sample. I'm not as big a fan on weed killer as some, especially if you have the equipment to deal with the land. Weedkiller just doesn't evaporate into the atmosphere.
Before buying any seed, You need to see if You can get the county agriculture agent out, Here they are free. Those guy's know their business and will surely know what is best in your area.
As far as seed, ask around local, especially any close by farmers, or at your local feed store, they will know what will grow best right there.
The issue I have with some pre-bagged seed like those, they are geared more for the part of the country they are sold in primarily, also the seed sizes can run from large to small, making planting depth tough (planting depth is one major cause of poor germination)
You may be in a good area to grow an alfalfa cultivar, that would last several years and deer love it, way over corn and many other crops.
As far as seed info and just for your reading, try the link below and click under "wildlife" on the left, then click Wildlife food plot guide. good short article about wildlife seed, planting and "whys". http://www.mbsseed.com/