I can't tell you how many threads we have on Oil, but you can't go wrong with what you already purchased.
I have been unofficially doing my own test of sorts, trying to use a different brand and price point of 5w-30 each oil change. I can tell you that I have not experienced a bit of real world difference in any of them except in my wallet. As long as the oil meets the engine specification and you change at recommended intervals, you can't go wrong.
Oils I have used - some more than once (dino/blend/synth). I have about 14 oil changes done.
Shell
Castrol
K-Mart
Pennzoil
Nissan (Kendall)
Wal-Mart SuperTech
Meijer
Mobil
Quaker State
Valvoline