Ammerty, I've never been a fan of Castrol, they've always seemed to be inferior performers of the big name brands. Personally, I'd just stick with the Helix Ultra as it was always a good oil in both my TJ exec & KJ AWD.
I agree with you in terms of Magnatec products (I never used it on the Magna, my Elantra hated it), but the Edge stuff seems to be pretty good. Coincidentally, I bought more Helix Ultra today on sale for $52.