Originally Posted by Phourc
Mine average 20 - 25 I believe and you have to remember, certain champions (AD Malz, Kass) are encouraged by their playstyle to spam spells outside of combat, and Singed.... Well, once he hits a decent bit of mana regen he has no reason to ever turn off his Q.
I believe I've fully stacked tear several times on a bottom laner, and since the maximum stack will drop from 1000 to 750, I'd say leave it as is and if it seems insanely hard to fill (and that kind of is the point, for a free, extremely powerful, item upgrade xP) change it at that point.
In addition, while Tear stays at +4 per cast, new Archangel goes +5 per cast so after Arch, another thing that will make it charge faster.
On the other hand, Manamune is changed to get +4 regardless whether it's basic attack or a cast/spending mana. IIRC the old can charge +5 max every 3 seconds if you keep up both casting spells and auto-attacking. On the other hand, auto-attacking makes it charge faster in the new one.
@SuperExplosion: Reading the descriptions, it seems that Seraph's Embrace has a fixed "+1000 Mana". Meaning, if it transforms at 300 bonus mana, you end up still end up with the max 1000 Mana (250 base + 750 bonus). It has to be changed to inheriting from AA for that to happen.
To be honest, I am more afraid of these items more than ever now (given who their current users are).