Blitz are fine, you can see how small the holes are in them so know the biggest thing that can get sucked into the engine and its nothing to worry about.People took some random old article using a vacuum cleaner and a coffee filter as the holy grail of filter reviews.I have a Blitz on my Z32 MAF and had one before on the standard MAF.
Whatever filter you get just make sure it has a heat shield, even if you have to make it yourself-mine is currently made of cardboard but as the filter stay cool I couldn't give a toss and I'll get around to making it out of alluminium when I have time.
I have a Blitz filter,induction pipe and cold air box for sale if you are interested.