If the bellows are good and the FP shutter is good on an older one and you don't need movements, the anniversary and pre-anniversary will provide you more shutter speeds. (going down to 1/10s). They are lighter too, but that won't matter if you are using an Aero Ektar. Stick with a pacemaker if you need to use a instant film back as the non-graflock ones don't open wide enough.