Funny, I've got the same watches - an IWC 3713 (second-ex Doppelchronograph with the flat sapphire) and the Polaris Tribute. In fact I'm wearing the latter right now! What I find, though, is that while domed plexi is reflective, it's not really all that bad - it's a fuzzier image, that ends up looking like it's in the background of the watch face.
The domed sapphire on the NTTD on the other hand, was a huge problem. The reflected images are perfectly mirrored, and block view of the dial / hands. I hated it.
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