Do you NEED to upgrade from the Presidents? Not unless
you have a compelling reason...and that's entirely your
call.
As for upgrades, I'm a Stradic user and now have one
Pflueger Supreme (haven't fished it yet, bad back). I don't
consider it an upgrade to my Stradics, but an addition to
my spinning reels.
Shimano, Daiwa, Pflueger, Okuma, all make good reels.
Best way to find out what feels right in your hands is to
go to a Bass Pro, Cabelas, etc., and try as many as you
can on the rods you're considering. See how they feel
in your hands, balance, the way they wind, etc.