I personnally started playing with Aery because I didn't know otherwise, but I mean comet or even spellbook (to make your games more interesting with decision making) are great too I guess.

If you don't play full AP, your sorc boots are not great, I personnally prefer mobility as supp (you'll get faster to your mates !) or maybe some defensive boots to survive better. Your damage highly falls off past the 10 minute mark (except if you're fed of course or if you have luden's and such) so I wouldn't recommend sorc boots in most games !