Sparx,
Go for the TLR fellah! I've used Mamiya TLRs and SLRs and (IMO) the TLR is quicker in use. Couple it with a trigger grip and you've got the stability issue sussed. You don't actually need a paramender if you've got a geared column on your tripod. Just mark the distance between the lenses on your column (fnarr, fnarr ) and when you're ready to go just crank it up. I did it this way with an ungeared Benbo and never had any problems. BLIGHTY.