Yea, I'm really leaning much more toward the RB over the RZ. Its hard to not get sucked into "the next best thing" attitude. In reality, I'm not a pro. I don't make my living off of photography. I don't have a full studio where I will be doing portraits.
I think overall, the RB fits my style more than the RZ. The 35mm cameras I own are a Nikon F2, Canon F1, FTB and Voigtlander Vitomatic IIa. Very old by todays standards, but extremely well built all mechanical cameras.