What good, small, light, split keyboard should I buy?

I’m looking for a good keyboard that I can use with my macbook when I’m traveling. It needs to be easy to take with me, it needs to have good keys and it needs to be a split keyboard. I’m a professional programmer so I type a lot and I don’t mind spending good money on a really good keyboard.

Examples of keyboards I have tried and sort of like (but are not what I want):

the original Microsoft Natural Elite - which is almost perfect except that the cursor keys insert/delete keys are too small and have the wrong layout.

The newer Microsoft Natural 4000 - like the Natural Elite but with decent sized keys and better layout, but the keys feel heavier. I like light touches. Still, this is the keyboard I switched to for my desktop machine after I wore out my last MS Natural Elite.

The IBM model-M feels nice but it’s not a split keyboard and you need too much force to press the keys. I have one, but my wrists get tired after typing on it for more than an hour or so. The Model M-15 might work better but is completely unavailable and would probably be MUCH too heavy to carry around.

The current apple keyboard is surprisingly good - the low-profile keys take a little getting used to but they’re very light and still accurate. But it’s not a split keyboard.
Anyway, none of the shops around here actually carry anything like what I want, so I’m searching the web, which means I can’t physically try any of them.

After a few hours of searching I’m currently looking at the Goldtouch Go! Travel Keyboard - which looks like it would be a perfect match (light, split, small), but it isn’t available yet. Also, the Kinesis Freestyle looks good, but it has no “feet” so you pay $40 extra for a bit of plastic to stand it on which also increases to total weight to 3.5 lb; more than the standard goldtouch adjustable.

Has anyone here used one of these or similar keyboards and would like to recommend (against) one?

That is why I still use my original MS Natural non-Elite keyboard, circa 1993. You will pry that out of my cold dead hands, assuming it lives longer than me.

I can’t help you on the new one. I haven’t found one that is anywhere near as good as my good ol’ MS Natural.