There are lots of seed choices for basil from MIgardener, Botanical Interests and Rare Seeds.
Seed Ideas:
Aroma 2- this one is a very hardy green leaf basil that is resistant to fusarium wilt. I grow this variety every year. High Mowing Seeds carries this one.
Italian Genovese – an oldy but goodie! Most seed companies carry this variety.
Blue Spice – has light purple (not blue) spiked flowers
Cardinal – this one has green leaves with red flowers. It is a very pretty plant!
Everleaf Emerald Towers
Large Leaf
Lettuce Leaf – this variety has large, crinkled leaves.
If you want to try growing some basil with reddish purple leaves, then check out:
Dark Opal
Purple Petra
Purple Ball
If you want some flavored basil, the I got some seed choices for you:
Cinnamon – I added this one to my list this year.
Lemon
Liam
Siam Queen – this one has a licorice flavor and red flowers
Sweet Thai – this variety is used in some Asian dishes.
Holy Kaprao