I've used DDM Quicken before with recharging, albeit with a cohort. If we are using recharge, I can actually cheese Divine Power ever seven rounds or so if I'm worried I'm going to be in combat. The duration is 7 rounds, but the recharge is 2 to 7. The downside is it continually locks my 4th level spells and I won't be able to do anything remotely stealthily if I'm casting every 42 seconds.