So after some testing I've figured out imp renew doesn't effect the 8/8 renew heal at all. +healing from gear and talents does. With this in mind IMO its better to get 5/5 crit and 1/3 imp renew since you are trading ~24 health per tick on regular renew versus 2% crit that can proc inspire, but id like another opinion.
Any other priests want to give some input, I'm the guilds 8/8 t2 priest moving forward so i want to get my spec as efficient as possible
The crit heavy spec http://db.vanillagaming.org/?talent#bxRhsV0oZdxtcc0Vx
The imp renew spec http://db.vanillagaming.org/?talent#bxRhsV0oZfhtcc0Vx
Thanks for your time