Unfortunately none I can think of - it's the 650 that sink you. IME they benefit from higher Zsource, and the warmth/bass that comes from that. But most of your OTLs won't like the 701 or Grados. OTC is expensive. And I don't like hybrids by and large.
The Yamaha RX-770 (now called RX-797) is an example of one that can do all three quite nicely, but if you want a little desktop unit - I'm not sure what to tell you. There are some desktop amps like the FiiO E9 that would be competent enough for all, but I don't consider it perfection for the Sennheisers (they're the only reactive one of the bunch, so they *do* care).
This is the "gamer" version of the famous HP-1! :P