here's my two cents. You just want a car you can commute in and look presentable, right. I know you probably hate the idea, but get a used honda. Cheap, reliable, and good on gas. Might not be that fun, but it will surely be quicker than the jeep.
But that's just me. cheap reliable transportation. And then you have your wonderful jeep for the weekends.
Also if you really don't want to go that route, I would consider this. Buying a new car now or within the next five years or so, would be silly. Why? Because it's only a matter of time before most cars are bio-fuel or hydrogen powered. I just can't see spending money on something that you may have to pay a shit load of taxes on because it runs one gas. And also I'm not some loonie who wants to save the planet. That's just seems to be reality.
But then again, you could always get an sti and use it on the weekends you don't use the jeep. Then get a honda for the commute during the week.