Darkwood if you want it to be lighter than usual perhaps, but you'd need a really low strength for that to matter. Greenwood makes it self-repairing. A gem makes no particular difference but can be explained away as part of the thousands of gold you spend enchanting the staff - you don't necessarily have to spend even more money to get a glittering gem on it.
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For the "gem," might I recommend the arcane battery? Despite its name, it will work on a divine staff just fine.
It's a lead container full of salt water, technically, but I see no reason you couldn't reflavor it as a magical gem set into the staff.
Also, whichever spells you will be using less (offensive spells or healing) are the ones you are going to want to put into the staff. It makes no sense to fill up all your caster slots with healing and limit yourself to a few offensive staff charges a day, when you use combat spells in every fight, but only occasionally need emergency healing for you and your fellows. Be sure to think about what you will need and when, so that you don't end up coming up short during a critical moment.