No idea about sony s series...found only the V,W and X worth taking a look at.
Again the sole purpose of this post is only to convey the correct information.
As I have conveyed in one of my earlier posts, in 37" size the Bravia is available only in the S series version. The 32" and 40" both have X, W, V and S series versions. At 32" the only difference between a S series and a V series is a so-called DM (digital media) port which the V series has and the S does not. Actually most reputed sites on the net suggest that the DM port is not a great thing to have, because it is Sony proprietary and you have to buy an adapter or something to use it. I would think in 40" this perhaps is again the only difference. At 32", both S and V are HD ready which makes perfect sense because at that size one is not supposed to pick the difference between a HD ready and full HD. However, at 40", they both are full HD, I believe.