I've been running a few 4 box teams up through lvl 20 to get the feel for what I can box with. I'd like to roll 5 on Mag with a team that I could eventually use end game PvE. One thought I had that I couldn't find much info on is 1xpally 4xshadow priest or perhaps 1xpally 3xshadow priest 1xlock. I guess the general theory here is that 3 or 4 shadow priests can keep up a pally's health and mana in shadow form without the need for a dedicated healer. the lock variation is obviously just to boost the shadow damage of party.

Does anyone have any experience with a setup like this or just opinions on end game viability of it?