Go with the EVF. The intake area of the BVMF-86 is too small to feed enough air to the Dynamax fan. I built the arf version of this plane a couple of years ago and used the 12 cell version of the EVF. Here's a link to the build thread and there is video of the maiden in the thread:
http://www.rcuniverse.com/forum/m_97...tm.htm#9749519
Here's video I took of Chris True's BVMF-86 which is of thevintage of your kit. It is flying with 10 cell EVF. It is quieter than mine. The high pitched fans you here in the video are of smaller edfs flying at the same time:
http://www.youtube.com/watch?v=qeYPhqRbvsw
The post above makes very good points. You will not get better customer service anywhere else like you will from BVM and BVM's field reps.
Kirk