I had an S950 and I only sold it at the time because I wanted to raise money to take my (now) ex girlfriend on holiday to Turkey where she wanted to go.
I love a good Jazz guitar, that's usually the sound I look for when I get a new keyboard, and I don't think there's been any keyboard I've owned that's had a bad sounding Jazz. Then your usual main sounds such as Piano, Sax, Flute etc..
Yeah maybe we are spoilt for choice in sounds? Do we really need that many these days? I think the SD7 has only around 300 or so, but the select few I've tried sound great. The SX900 and T4 has a lot lot more, maybe 4 times that amount! But some sound very similar. The synth sounds on the SX & T4 are superb as well as the vocals.