i have a sa-8 d2 and i was wondering what box would be better. I am going to buy a pre-fab box and don't know which one would be better have a amp running 300 watts rms. just wanting the best option, which one should i get and why? i know it likes a ported box from .6 to 1.25 one is .80 net box so .70 after displacement. this one mentions a 40" port is that good or right for this woofer? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230527532374&ssPageName=STRK:MEWAX:IT and the other is 1.10 net and 1.00 after displacement http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350398128241&ssPageName=STRK:MEWAX:IT