I bought the C&L 76mm unit for 19lb injectors (it's aluminum). I got it with a 9" conical
K&N filter, a plastic "heat shield" to help separate the filter from the engine bay, and their truflow aluminum inlet pipe. It was $270 on ebay for the whole thing, plus shipping of course. I never had any problems with the C&L meter. Install took about 20 min. Afterwards the car started and ran just fine, no problems. I DID unhook the battery cables so the computer reset itself though - don't forget this step.
There are a few basic things I've picked up since reading the forums about mass air meters.
The C&L unit uses sample tubes to calibrate the injector size. So if you get a 19lb meter now, and upgrade to 24 lb injectors in the future, all you will need is the new sample tube from c&l which is $20 i think. With the Pro-M, you will have to get it recalibrated for 24lb injectors, and that costs about $100.
The C&L is not blower/turbo friendly. A Pro-M is better if you have one.
Any turns in your intake pipe before the mass air meter, such as a cold air intake that curves into the fenderwell, can mess up the reading. You will have to twist the meter a certain way so it works correctly - i think this is where a lot of people's problems come into play.
I will stick with my C&L meter until I am finished with all of my engine mods, then I plan on selling it and getting a Pro-M because I will not need to alter the calibration again.
BTW - with the C&L it reuses the factory electronics, so you will need a torx bit to unscrew the plastic case and sensor from the stock meter. My package came with the right bit.
Either one is probably going to be a good choice. Get the Pro-M for sure if you're not going to upgrade your injectors in the future.
Edit:
Here's a picture of mine: