Sony CDX-GT decks, 120dB Sig-Noise?

My uncle is looking at one of these decks (GT300) and I am trying to talk him into getting an Alpine for about the same price (CDA-9847).

What is the deal with the really high signal to noise ratios on the Sony CDX-GTXXX decks? They list 120dB on every website I have seen them listed on. Is that just a blatant lie, marketing gimmick, etc.? All of the other brands seem to have 105dB.

Also, what else do you guys reccomend in the $150-$175 range that can play MP3's and is XM satellite ready?

Thanks guys.

Just inflated numbers, like peak power outputs.  For the price, the cda-9847 is tough to beat, and does not have the typical problems of the higher end Alpines with glide touch.  I'm sure Rob or someone else can give you a number for an Eclipse.  Look into Kenwood as well, and stay away from Sony and Pioneer (my opinion).

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My ex once told me I have a perfect face for radio.

At our shop we've tried many of new sony heads, gt 100, 200, 300. The alpines still sounded fuller and cleaner. I'd stick with the alpine.

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2003 Ranger EXT Cab
Sony CDXC90, XDP210EQ
Alpine SPX177A
JBL p1020, BP600.1