Best dip for Divine casting?

[barna10]

What is the best 1 level dip you can think of for a CHA arcane caster to take to qualify for a PrC requiring both arcane and divine casting (and a domain, specifically Dweomerkeeper)?

[Courier6]

Just take a level of cloistered cleric, even if you can't cast a single spell the domains/devotions are really nice.