Hey there :)
All I can say is... know your job, and play it wisely. If you,re an experienced WHM and have merited the right stuff, you dont need 6-7 different sets of gears...
Like a few persons mentioned, fully merited Shellra V and Protectra V are required, along with a capped enhancing magic skiil, full AF3+2 that enhances bar spells effects( and isn't bad for that +20 on aupice's subtle blow granted aswell ), decent or event capped curing potency (now at 50%) and so you will be, in my humble opinion, a very good white mage...
Also if you can, and got the time, grab those relic pantaloons, as they are worth it too for bar-spells enhancement. And keep in mind that some WHM out there are geared with top stuff and are lame as hell because they can't play the job right. Healers are all about making the right decisions at the right time ;))
... and a so ungrateful job too, sometimes... because if it's a success well people will say that tank did a tremendous job but if its a wipe... damn! the WHM sucked badly!
Have fun! =^.^=