I agree with the FMIC choices

With regards to the filter/CAI, it all depends what you want:-
panel filters are fine, but I removed my SAI and needed to buy an AGU airbox as it doesnt have the SAI so no hole in the airbox casing
The ebay ones go quite near the floor and if your lowered very close to the floor and people are worried about it sucking water up

The next choices are home made/source parts, I have a small tube off the MAF to an air filter with a cold feed
Its all down to personal choice, panel filters are quiter, cones you hear the DV noise more
