Well, it's your lineup, just my suggestion (you don't gotta change it just because of me
) Wagon R would be a Scion killer... and the Swift would be cool, but I think you'll need to refocus the Aerio a bit, as they may overlap a little, both going for the young crowd wanting a sporty, compact, different, and inexpensive car... maybe make the Aerio a coupe to go agains the Tiburon? Just a suggestion...
I g2g, tomorrow I'll leave a few more suggestions if you want 'em... but like I said, you don't gotta change your lineup, just some ideas to think about...