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I have been reading reviews of the GX200 camera that will be used in the DX-2G and it seems that the performance is very good. Here's a link to one review: Steves Digicams - Ricoh GX200 - Hands on Review. The beauty of the DX-2G over other cameras is having a lens that can be put on or taken off underwater so you can shoot both macro and wide angle on the same dive. A lot of other cameras require you to choose one or the other before the dive.
The GX200 is an impressive camera and the DX-2G is sure to be as well. Just to clarify the product specs on the 2G, the camera itself is equipped with a 24-72mm (35mm equiv) lens and has built-in macro capabilities of 1cm or .5 inches. The SEA&SEA wide-angle lens (#SS-52116) and close up lens 125 (#SS-52119) are optional accessories that are wet mountable.
The DX-1G has a shutter lag of .1 seconds and is one of the fastest on the market. You may be referring to image recording/writing to the memory card in RAW, which takes approximately 3-5 seconds based on battery level. This write speed is increased on the DX-2G by a new image buffer.
You can review some gallery images from a DX-1G and S&S strobes from photog Steve Blume in Australia HERE or check out the recent U/W Galleries from Steve HERE
The 1G and 2G are identical in specifications for your requested shots - ie macro, RAW (with exception of 10MP vs 12MP) and wide-angle.