Here's a gen 16520, it varies from the Silix model with the black borders around the subdials whereas the Silix model has silver borders, which is a dial variation, I believe and not significant. The biggest deal with the asian 7750 Daytonas is the subdial spacing, they're further out than the Zenith powered gens. I don't think it's that big a deal personally. If it bothered you, you could build a Zenith powered franken, but those run around $2500!
But there is always a liability factor whenever one purchases any asian 7750 watch. Given the lack of QC, and not necessarily clean build circumstances (lack of proper oiling, unclean surroundings), any asian 7750 is prone to problems. It's the luck of the draw. When I buy asian 7750's I figure there is the initial cost and the servicing factor that have to be figured into the equation. But once an asian 7750 is serviced (around $200 usually) it should be a very dependable watch.
If I were going to buy a modern Daytona, it would definitely be a seconds at 9 model.