if you want the economy, go with subcompact Japanese. Like Sentra, Mazda 3, Corolla, or even Focus.
I myself currently own Geo Prism (Toyota Corolla), and gave me nothing but trouble free operation while maintaining 30+MPG.
But if you have a kid or other obrigation, then may be mid size cars like Altima, Camry, Fusion, Mazda 6
I mean choice is endless.
I would not get another money eater (i.e. Spending more money on performance upgrade, wheels, exhaust), like Civic Si, Sentra SE-R - U know, kind of car that you WANT to spend money on, or others that REQUIERS you to spend more money - like big pickup with V-8 or other so called sporty car that demans higher insurance premium.
i personally thinking my next daily driver to be choice between Mazda 3(I like it, but its been around for a while), New Sentra(which I really like, and its just had model change), or Fusion/Mazda 6(if finance allows it). I thought of new Corolla, but I do not like current model...