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I think bang for your buck would be Mobil1, you can get it at Wally world for about $4-5 depending where you live.
As for drain intervals, looks like AMSOIL packs a bit more and possibly will last a bit longer than M1.
It depends what you want to do. I change my oil every 5-7K, and I do use Amsoil, but I think I will change back to M1, just cost and convienance factor.
Redline, great additive package, but I'm not racing or have a performance engine. Just looking for decent protection. I could go back to dino oil, but I would have to change the oil every 3K or so.