Update:
I finally got a day off, so I decided to spend some time test driving cars.
First, I went to the VW dealership and asked to test drive a TDI. The salesman told me that they don't have any available - this is a large Houston dealership! - and that they weren't likely to have any more available anytime soon. He said since the Jetta is dropping the TDI for a year, they are basically as scarce as German Castrol. Plus, he told me they're "getting $2,500 over sticker price" on them, which effectively cancels out any potential fuel savings the car might have offered. Goodbye, Jetta.
I then test drove a Honda Accord. I sat in an EX model and my head was crammed into the roof (less head room with the moon roof), so I then opted to drive an LX Special Edition. The car was nice and the 4-cylinder really had as much power as you'd ever need, but I have to be totally honest when I tell you it wasn't all that great. Basically, it was a REALLY boring ride all the way around. Not necessarily a deal-breaker, but a snoozer to be sure. I'm not really sure I could stomach paying $23,000 to be thoroughly bored with my new car.
I then asked to test drive a Civic, but the salesman told me they didn't have any available. What?! Again, this is a HUGE Honda dealership here in Houston. He told me the Civics sell as soon as they hit the lot. He also said they get full sticker price for them without any questions. I left there and drove to another enormous Honda dealership only to discover the same thing there. No Civics. Goodbye, Civic.
I then stopped by a Ford dealership. (I'm partial to Fords due to my excellent experiences with their cars.) I drove a Fusion SE with the Duratec V6 and leather interior. I've gotta say, that car really surprised me! It had excellent road manners, PLENTY of power (albeit only 29MPG on the highway), a very nice transmission, and overall felt very tight and quiet. It had all of the options I'd ever want and was very reasonably priced. Furthermore, Ford is always happy to bargain and give you a good deal. (Resale doesn't matter to me with this car, so that wasn't a concern of mine.) Plus, the Fusion was really comfortable for a mid-sized sedan - certainly more comfortable than anything else in that size category I've driven.
Needless to say, I'm going to be taking a long hard look at the Fusions. I'll probably opt for a Fusion SEL V6 with all of the bells and whistles. I'm guessing I can get it for about $20,000 plus TTL. So, I wouldn't be surprised if one of them ends up in my garage before too long.
Thanks for all of the comments so far.
Keep 'em coming if you'd like to chime in!