With altcoin failing I'm been trying to see which is better straight litecoin mining or still hashcow, but out of hashcow and middle I seem to do better on hash.
No numbers yet, i keep tweaking (crashing) my miners while at work

noob i know.
For me per 1MH/s:
Middlecoin: 0.015
Hashcows: 0.003
middlecoin has been falling for me. It used to be around 0.015, but the last couple days it's barely made 0.010