Honestly, you can't go wrong if you choose any one of those oils listed, they'll all work very well in your car. You might find you'll have less oil consumption with Redline or Amsoil though, as they are on the thicker end of the 10w30 scale. A lot of LS1s still have oil burning problems with Mobil 1 10w30 since it's on the lower end of the 30wt scale. Definitely stay away from 5w30 in the LS1, it'll just make any piston slap issues that much more noticeable.
PS-I miss my LS1 Formula something awful, it was the best car I ever owned. I traded it for a 97 GTP, but then quickly realized it was a mistake, but I couldn't afford (nor could I even find) another 98 Formula, so I got the 95 instead.