I have no problem with ABS modifiers - they don't get shiny as fast as 37 Q-Z and space.
Those engraved ones look great indeed...
I took 'black on white' PBTs mainly because they will look better with stock Filco modifier keycaps which are labeled too.
I see very nice. I have the same white pbt set. Like them a lot. You could always look at wasd. They have gray but it would be ABS. So you may not like the feel with half the keys a little rough and the abs keys all smooth. Here is there iteration of the board you posted, except it has engraved keys.
Show Image
(http://lghttp.12576.nexcesscdn.net/805EFD/magento/media/gallery/cache/800x533/523ee8f65d57d1a33c013333a18aed83/cust_creations01.jpg)