Actually I test drove the 328i about 4 or 5 weeks ago and was very impressed back then. After I test drove the 320d I just wanted to drive it again for comparison in the same conditions.
Even though I've done the deal, I might go back for a drive.
In the research process, I test drove the A4 quattro. The handling was awesome, but the suspension was so hard... not bone jarring nor uncomfortable - but I didn't like getting tossed around in the car. It also lacked the responsiveness of the 328i. I guess it's a heavier car and the torque kicks in too late.
I also wanted to avoid repeating the DSG issues I have in my Golf. Didn't help that the Audi salesman wasn't taking me seriously at all.