I did a bit of research for you while hanging out on the wet shaving forums, and a few brushes kept popping up again and again for face-latherers:
If you are okay with sticking to boar, the Semogue 1305 seems to get rave reviews from face-latherers, and it's only $20. If you want to try a badger brush and money is not an issue, the Simpson Duke 2 and 3 seem to be the consensus kings for face-latherers. They are about $90 and $130 respectively. Hope this helps.
Personally, I bowl lather creams, so I need a floppy, big brush. You want something with a tight knot, fairly narrow and not a ton of loft.