If this is your first grow, I would recommend Northern Lights, which is very forgiving. It's recommended by Ed Rosenthal in his book Marijuana Grower's Handbook, and widely agreed on.

Sensi Seeds recommend the compact Indica varieties for the beginner grower, especially the Skunk strains: Hindu Kush®, Afghani# 1®, Northern Lights®, Black Domina®, Sensi Skunk®, Skunk #1®, Superskunk®, Shiva Skunk®, Skunk Kush®. These are particularly fast, vigorous and powerful mostly-Indica hybrids.

There are also Indica/Sativa hybrids - such as Silver Pearl® and Marley's Collie® - that retain the simpler Indica growing pattern.