You've got to bring these types of guys up when they're ready to hit near their ceilings, IMO. Sure, they're cheap whenever you bring them up, but if they don't hit they aren't worth it.
Personally, I'll wait all of next year as well to decide if anyone in AAA is ready to help permanently in Cincinnati.
Sure, we'll have some September call ups, some competition in ST next year, etc. But, there are no hall of famers in AAA right now, that's pretty safe to say.
In the meantime, I'm in favor of restructuring Phillips deal through 2013, similar to Rolen, so we have more to spend next year - and he's easier to trade. But, really, I'd like him around for 3-4 more years.