to be honest i bought my boxster 2.5 new in 1998 and i know a few boxster owners near me who have 3.2s and 2.7s and i find no difference in the noise level. Noise is part of the soft top, now my dad has a ferrari 355 and that is very noisy at high speed, super quick but noisy. But porsche isnt that bad its normally a poorly fitted rear window that creates the noise and not the actuall top itsself.
I did find someone that creates aftermarket tops on ebay but i dont know what there like, i very realy have my top up, even if its snowing the top is down
hope you find a Boxster. I think the boxster prices have come down due to the fact of the 987 or people cant afford the payments as this was featured on fox news. It didnt say boxster but did state second hand market, i would say boxster fits this perfect.