Taffeta Curtains: Faux or Real?

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As you know, we've just moved into a new home. Thus far, we do not have curtains up, yikes! In the past, I've always gone with 100% silk dupioni for our curtains. They're gorgeous and pretty affordable. However, while I was packing up the old house, I came upon my specialty ribbon stash. I love luxurious ribbon & the pretty 100% silk taffeta ribbons were always one of my favorites to use back in my wedding invitation design & assembly days. The ribbon prompted a quick google search and in no time, I'd ordered & quickly received fabric swatches. Unfortunately, I've been paralyzed ever since! I simply don't know which fabric to choose! 

Generally, I believe that the real thing is worth any extra expense it incurs. For example, pleather vs. leather... no contest. Leather wins every time. 

My dilemma:
Moving is expensive and the faux taffeta is about half the price of the 100% pure silk taffeta; and with all the curtains needing to be 108" in length, and a whole house to do, windows are getting super expensive, very fast.

The swatches are small, and it is really tough for me to imagine just how great the difference in quality will be. Will the faux taffeta look like a hideous discount wedding dress or will it pull off the look of a luxurious 100% silk designer dress? I'm at such a loss and could really use your advice!