Thanks for all the help. There are certain features unique to the EL-720 that were the reasons for my choosing it.
Among them were:
* Real aluminum upper casing.
* White, as opposed to clear keys. (I think the white gives the letters more definition as opposed to seeing all the transparent artifacts of key moldings in clear keyed illuminated keyboards)
* Full sized keyboard with a slim, small footprint.
The EluminX boards have clear keys so I'm not really considering them. The EL-715 doesn't have an aluminum casing which, alone, isn't a deal breaker. I just don't care for the look of it. And the one with the hand rest isn't particularly attractive either. The EL-610 is too small.
The closet I've come to finding an acceptable "it'll do" candidate is this one...
http://store.yahoo.com/outletpc/c0490.html
That one looks slim, it's nice and sleek, it's silver (though not aluminum), and it has white keys. I wish I knew something about the brand or could find a review, though.
It LOOKS like it might be a Zippy-manufactured keyboard with a custom casing on it. The key placement is identical to the EL-715.
Does anyone know anything about it?