I've never seen that RK hood in person, and maybe it's just the pic, but that RK hood just looks like it doesn't line up quite right. I do like the look of the RK Sport hoods but you probably want more functional venting area. If I were doing an LS swap I would probably lean toward the AEV hood for the best looks and function combo.
The AEV does a great job with heat dissipation. Not to mention it does look good. But in all honesty a basic good will do the trick. And you can always add a poison spider hood vent or who ever else makes one. They look great and are functional.