Here are stat weights for 2.4 for Holy priests. Should I ever decide to reroll a holy priest, these values will doubtless have changed before I hit 70 (or 80). By the way, if you want a quick way to check these values in-game without using a calculator, the Pawn addon can quickly give you this calculation.

Weighing Healing Stats in Patch 2.4 « A Dwarf Priest

Here are our final stat weights:

Low Raid Priest (T4ish Content):

0.61 spirit /0.52 int / 0.2 stam / 1 mp5
0.19 heal / 0.06 spell crit / 0.02 spell haste

Mid-Raid Priest (T5ish Content):

0.63 spirit /0.51 int / 0.18 stam / 1 mp5
0.19 heal / 0.06 spell crit / 0.03 spell haste

High-Raid Priest (T6ish Content):

0.67 spirit /0.52 int / 0.15 stam / 1 mp5
0.19 heal / 0.06 spell crit / 0.05 spell haste

Note: Human priests should multiply the spirit weight by 1.05 due to their racial bonus (0.64 for low; 0.66 for mid; 0.70 for high).