You'll be happy with just a tune and cai. I think with just these two mods, it took off around .5 tenths off my 0 to 60 times.
Yeah I think I'll be going with a Steeda CAI/Tune first, seems like it will be the best bang for my buck at the moment.
My DD: 2013 V6 Auto (Pony Pkg 202A) Performance White, Comfort & Security Pkg
Future Mods: Steeda Tune & CAI, GT500 Quad Exhaust, Stalker Hood, (still debating which spoiler)