line choice for beginner

I want to start fly fishing and have rod (5 wt) and reel (7wt). I will buy a
5 wt floating line since this has recommended for me, but am wondering
whether a weight forward or double taper would be appropriate. I see the
advantage of the DT is that you get twice the use because you can reverse it
eventually. I would also think that since my reel is a bit large for my
rod/line weight that a double taper might be appropriate. Do you guys think
it would be a good idea or should I just get a weight forward line? Also,
does it matter which exactly one I get? I have been told to get the best or
close to it. Do you have any specific recommendations as to brand?

TIA

Dan