I paid just under $1700 for mine, which is in the upper end of the scale for second-hand LLDs. However, I was glad to pay the premium, as it was a face-to-face deal and the watch was in excellent condition. Also, I was having a hell of a time finding a No-Date version of the Diver.
Unfortunately, the closest we've come to a Super Compressor rep is a very crappy looking IWC Vintage Aquatimer. (I think watcheden still carries it.) Alternatively, there's a French eBay seller (Lucawatch) who carries unbranded homages that sort of resemble the Polaris. Feedback has been good from guys who bought these. Finally, it's still possible to get genuine vintage Super Compressors for less than $500 (see listing #160494441861). But prices are rising.
whoever: As PeteM points out, it's an Aqua Lung "Calypso" depth gauge, which I picked up a while back for my vintage Tropic rubber collection. Wish I had a Doxa to go with it, though...