I have a K&N off road filtercharger kit and love it they did a test on it in mach1review.com other good ones are c&l they have a complete system filter sheilding tube and MAF for under 400 my K&N was @ 209.00 tyy aj-usa.com for the k&n or rpmoutlet.com for the c&L. I also hear great things about the dense charger too.
If you want max hp/tp consider this CAI but the shaker becomes a sorces of cooling your engine only. The JLT RAI you can do as I did...do a search on the site. You lose a couple HP but it's keeps the shaker as designed. Buy the combo and have it painted and you can put on the CAI or make a RAI best of both worlds.
I agree, the Street Smart intake is the best looking intake available for the MACh1 right now. I have the K&N Breather Filters on my crank cases so it looks really good under the hood. I don't have any pictures readily available though since i'm the middle of a move right now.
Check the intakes out the link that 34 Ford left. I extremely pleased with the way mine turned out, I also bought the 80mm MAF.
Here's a shot of mine with the snorkel tube still on, Most take it off and use the shaker to cool the engine bay. These unit are making over 10RWHP and their been dyno of up to 20RWHP and 15RWTQ but I don't know if that every car.
The second picture is how I have mine right now with the shaker fully functional. I got the Combo kit for $15 more, it contains parts for both the RAI and the CAI and all fully painted for about $265. It's much cheaper if you don't wanted paint the color of your car.