Not knowing anything about the beers you want to filter I should offer up a bit of advice. This is based on my experiences and tastes so take it as is.
I use the 5 micron as a general all purpose filter. It does not strip out much for flavor and leaves just enough yeast in the beer so that I do not suffer wicked hangovers. I also believe this residual yeast helps improve the shelf life of the beer. Your beer will look clear unless you significantly magnify it.
The 1 micron will strip flavor. I have a few of these and only use them on light beers. Cream ales, most lagers, kolsh and like beers where a slight flavor loss does not significantly impact the end product. They are also much easier to blind.
Blinding the filter does not impact the beer in anyway but it does make it impossible to clean it correctly. If the filter is not blinded you can keep a spare keg around for cleaning. Just back flush with some well dissolved oxyclean free, rinse well with water and sanitize with starsan all in a back flush direction. (This will also sanitize the keg.)
You can also purge the filter and housing with CO2 by simply connecting the filter up to the receiving keg 1st and allowing some of the co2 from the purged receiving keg to flow backwards through it.
Also, boiling a filter to either clean it or sanitize it will trash it.
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