I actually got this libram yesterday and I sit around at 142 mp5 (non cast) just buffed with my own blessing of wisdom, 1982 unbuff healing, 25% crit, etc... I actually liked this libram: Libram of Mending Libram of Mending - Item - World of Warcraft because it offers you 22 mp5 for 30 seconds.
Now, the best part about this is that you can cast Rank 1 Holy Lights and it procs, rather than casting Rank 7 through 11. Its actually pretty useful and I used it yesterday throughout Zul'Aman and the extra mp5 was considerably helpful.
Just giving this as a tip for other paladins in need of some mp5. Also, everytime you cast Holy Light (whatever rank) the proc resets to 30 seconds and it doesn't stack.
Have fun .
Edit - Forgot to add that this libram is the best that you can get if you're a player like me that keeps the holy light buff up just in case (decreased cast time). So while you throw in those lower holy lights, you get some mp5 too .