I'd have to agree with suitcaseman - I don't see the speed as being unstable. It is a low drag aircraft which means the speed can fluctuate wildy in gusty bumpy conditions, but fluctuate it does, and that is not the same as unstable. I have watched guys go from idle to full thrust in bumpy conditions on approach wildy chasing the speed trends while others sit there with stable thrust and allow the speed to rise and drop but with no large long term trends hence I would tend to disagree about the 145 being unstable. As for being a handful in high winds, yes, but it is swept wing. I can't think of any aircraft that are not a handful when it gets really windy, but you just have to show the 145 whos boss!
As for the cruise noise, get a bose-x or or a DC headset with ANR like mine and its dead quiet in flight.