I use HP5+ and home-mixed ID-68, which is meant to be very similar to Microphen. Not done any proper speed testing, but exposing at 400EI gives easily printable negatives without having to stray too far from G2 paper.
A couple of scanned examples with this combo, exposed at 400EI:
http://www.flickr.com/photos/nord_modular/4531983105/
http://www.flickr.com/photos/nord_mo...n/photostream/
It also works well for pushing. Here's one exposed at 1600EI:
http://www.flickr.com/photos/nord_modular/3729278308/
Ian