http://www.silentpcreview.com/article116-page1.html
Between the 3700AMB and the 3700BQE, which would I choose? It depends.
If I didn't want to mess with cutting out the grills I'd go with the 3700BQE.
If I wanted the best "turnkey" Silent PC case I'd go with the 3700BQE.
If I was willing to mod the fan grills myself and was going to replace the PSU and case fan with the quietest versions I could get, I'd go with the 3700AMB.