The whole gimicky Balanescu Quartet album, "Possessed", all instrumental, is pretty good. Senor Coconut's "El Balle Aleman" is the clear winner as far as Kraftwerk cover albums go...
While I won't argue with you that the Sr Coconut album is better, I'd question labeling the Balanescu LP as the "gimmicky" one, given the whole high-concept Coconut thing. All good stuff though.