I played Netrunner competitively from a few months after release until about two years ago when I "retired." Now, I'm considering getting back in casually with my wife who has shown interest. I've got a core and a few data packs and have sleeves all of the cards with clear Ultra Pros. Back when I used to play, I sleeved with opaque Ultra Pros so that I could play with alternate art cards. However, I no longer have any AA cards (sold them all) and really don't plan to get any.
Is there any reason that I really should use opaque sleeves if I don't plan to play with alternate art cards? Is there any risk that the backs of future printings might be a slightly different shade (like AA cards)? I really prefer the look and feel of clear (I like seeing the back art). But I don't want to sleeve 1000+ cards over time just to have to replace them with opaque down the road.
I almost always use the FFG clear sleeves. The only time i don't is when we play in a store tourney and i'm using alt-art cards. Actual tournament rules say you're supposed to use opaque, but our group isn't really sticklers about that and if you're not planning on playing in tournaments, it's a moot point anyway.
Unless FFG does more of the in-house printing (which they haven't yet, but who knows), you should be fine. Go with what you like.