I've been to 2 audio shops and both have recommended Kenwood Excelons for replacements speakers...KFC-X692 (6x9) up front and KFC-X175 (6.5) for the rear. They said these should produce the best sound using the stock head unit. I found both on onlinecarstero.com for $65 a pair. They're $150 and $100 in the store.
I want to go ahead and order them, but the 2nd shop told me that half the Tacomas he sees have 6x9s up front and the other half have 6 1/2s. I want to go ahead and order for such a cheap price, but I'd hate to get one of the trucks without 6x9s. Guess I should add that I'm currently waiting on my 09 DC w/o JBL to arrive.