absolutely go 12/12
get 40w warm white from Home Depot.... they're kinda pricey though, maybe you'd be better off buying the bulk packs of the 23w... either way, your choice.
rig up lights EVERYWHERE. with a plant that's 5' tall already you will need A LOT of CFL's all around the sides, top, everywhere. on two small LST'd ladies, I was running over 400 ACTUAL WATTS (not equivalent) of CFL. so that's something like 14-20 bulbs. keep them no further than 2 inches from your plant otherwise they're useless.
CFL's DO get hot, so think about ventilation. it'll be an issue with the amount of bulbs you'll be using...
and on the subject of going from out to inside, CHECK FOR BUGGERS!! they're sneaky and they hide and with a plant as big as yours it'll be hard to catch em. but keep your eyes peeled.
most of all GOOD LUCK, I've never seen a plant that tall go under CFL's before so should be interesting.