I personally like the Scion xB, but the only guy I know with one says it's a mom car and is trading it in for a truck. Celicas look nice IMO, but they're harsh sounding on the interior and the suspension isn't really great. They're like a sported up Civic, where all they did was juice up the engine. Which leads me to Civics, which are great cars if you just want a car to take you from place to place and not guzzle gasoline while it's on the job. It's a very practical car. Whatever you do, if you get a Honda Civic do not develop an interest in modifying your car.
Yeah, right now I'm mainly just looking for a car to get me around (with good gas mileage to boot). Honda and Toyota are cheap and reliable, which is what I'm looking for. Since Scion is just a Toyota mini-brand, I figure they aren't half bad either.
If I get a Civic, I probably would modify it; I just wouldn't mess it up with a poorly attached body kit or a mismatched paint job - I'd take my time and do it right. No weird exhausts, no thin tires, no freakish graphics, and NO giant stereo system. The most I'd do is tweak the paint job slightly (maybe do what my dad did to his HHR and paint the grill and wheels black, completely removing hubcaps), and get a somewhat sportier-than-default trim added. Something more like
this, without the alloys (and probably a less flashy trim; no bucket seats). Nothing fancy, just clean.