Yaris vs. Corolla

[bmlors]

I'm new to the Yaris world, but am strongly considering purchasing one once this "Cash for Clunkers" program goes through. I drove one at the local dealer yesterday, and their only suggestion was to consider a Corolla. For the options I want (15" wheels, keyless entry, cruise -- basically the power package w/ keyless), the pricing after incentives is almost the same ($300 more for the Corolla). MSRP is obviously significantly lower on the Yaris, which will impact registration and insurance pricing. It appears that MPG is nearly identical. Any thoughts on comparing the two? I do have 3 kids, so the additional size of the Corolla is attractive, but certainly not a requirement as this will primarily be a commuter vehicle.