Blackberry Curve with best call quality?

Hi!

I would just like to know what version of the Blackberry Curve would have the best call quality? Right now, I have the Samsung Impact, and my wife says that it sounds absolutely crappy! I took several months to decide on the phone I wanted, but I guess I still didn't spend enough time to check out the call quality on the Impact.

I have heard good reviews on most of the Blackberry sets, especially the call quality. My wife says that even my 'very old' LG flip phone from about four years ago sounded better then my 'new-fangled' Impact, and that phone had the minimum bells and whistles! Anyway, if people can chime in with their opinion of the call quality of the Blackberry Curve line, I would much appreciate it! Thanks!