On my twinlens I use the e36re because it attaches to the pistol grip. The e36re is also nice because it lets you use a synch cord that locks at both ends.
I also can say the Nikon SB-28 works well as a conventional non-TTL auto flash. I use that one more with the Rollei SLRs because the SB-28 has an adjustable field of coverage that works well with the 50 and 40mm lenses.