I have the DX-1G and am quite happy with it. Splash-x is wrong about the SS mode being raw only. The options are: RAW, RAW 3:2, JPEG Fine 3648, JPEG Nice 3648, Fine 3:2, Nice 3:2, Fine 1:1, Nice 3264, Nice 2592, Nice 2048, Nice 1280, and Nice 640.
There is a noticeable delay when writing RAW files for sure. The 1G only has a buffer large enough for 1 RAW image. The 2G is spec'd to have a buffer for 5 RAW images.
The 2G looks to be the next step from the 1G as it doesn't have really anything new just improvements.
The 1G has an excellent battery life, has pretty easy to understand controls, and takes some very nice pictures.
The only bad thing I have to say about it is that a few months after getting mine I've got some hot pixels showing up in RAW. I've already talked to my LDS and they told me to bring it in so I'll see what happens.
I really enjoy having the wet mount wide angle. I've been on a few dives where I went down thinking macro and saw something that I wanted to get as a WA.