Your best bet is long tube (cold air). It will have the best gains. You are going to have to remove the bumper to service them but it is a couple of bolts a push clips. I opted for the Injen CAI because I like the dry flow filters they use over the K&N ones that need to be washed and oiled. I also like the painted black option. If you have ever had polished intakes you know they are a pain to keep looking new.
To make the right choice, use the new (advanced) search function. There are tons of reviews and details about the systems you are looking at. Either way, good luck with your choice!