EL header gains are pretty impressive. Not everyone is a fan of the sound, but if you are then go for it. It looks to be a nice upgrade. A dyno tune should also be a good increase over your current Cobb map as well. EFI Logistics is verrryy good from what I've seen, but there's no reason to drive 4-5 hours if you've got someone knowledgeable and reputable closer by.
I would take a good look at the KillerB header. Yes, it's more expensive but it is very well designed. I've read nothing but great things about it.
Do some research on wrapping and ceramic coating as I think these things are worth considering as well. Just my two cents
Good luck and post up them results!