Unfortunately, the Filco tenkeyless can be a bit tricky to find (and of course are not backlit).
I also use the Das Keyboard "ultimate", which has blank keys. I rarely look at my keys anyhow, so it's mostly a conversation piece at the office :P
It's a "gaming" brand keyboard I guess but it's half the cost of a Filco and comes in 4 different switch types. I just got one, seems pretty nice, although I only use it for gaming and my MS Natural 4000 for typing. Though I wish MS would make a tenkeyless version of the Natural 4000, because I do dislike the extreme width (they're making a new wireless ergonomic keyboard that's tenkeyless but it has scissor switches and I don't really like switches with little travel - almost went crazy when they gave me an Apple thin keyboard during an internship, and I quickly went to their old computer parts storage and got an older Apple keyboard to avoid losing my mind).
The only drawback I have found is some 3d modelling tools assume a keypad in their default settings. Obv. you can remap the keys but its not as natural and makes following tutorials harder. If I were to use these more I would consider purchasing an external keypad but not to permanently give up such prime desk real estate for it.