Sup bro. I can personally say the 04-09 Mazda3 are pretty good cars. They're like the newer Civics of the Mazda world, haha. I bought my wife an 05 bout 3 years ago, for about... $13k with 45k miles. Red, 4dr, Auto.
Tranny shifts smooth, motor picks up nice (much better then the 6GA =/).
Comfortable seats (its the car we take on road trips). Nice red interior/dash lights.
Steering wheel is nice/small and perforated. Turning/handling is tight and nimble.
So far, no issues. Just regular maintenance. Its been treating us good. I dont lose sleep or anything worrying bout its reliability. Plus it has OEM blackhoused headlights, with projectors! Has OEM side markers, the glove compartment is huge (you can fit a 6 pack in there) and it even sits lower then my 4x4 accord..... -.-
The only thing i've done to it is get 15% tint all around, looks great, and omfg no dot-matrix.
My only regret is buying the base model (noticeable missings are the sunroof and foglights). My buddy has the 3 as well, but with a sunroof, and its big and fantastic (dont quote me on that one.....).