Well if your talking this model specifically and your asking ole R2 from Minnesota, I would always go with an ETA clone model. Those selling genuine ETA are only going by what the factory tells them. That's whole other debate, but I would never expect a 100% swiss ETA as you won't get a certificate of origin.
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Everybody is out of the V3 PO 42 and the model they sell now has a Helium valve that sticks out too far and a crown that is too short.
Out of the box, the 45.5 UPO is a better buy as Daytona4me can get these for 180.00 with an ETA movement.
If Silix can give you exactly what is pictured by giving you a picture before shipping it, go for it. With your regard to your Canal Street watch, I bet it has an inexpensive 21J movement so if it breaks you can put another in for about 20 bucks. The advantage of buying the ETA model is mod-ability and finish. I put a gen dial, hands, band, pearl and crystal on mine.