if you read the posts in this link, you may get a better idea of what to use with the butcher:
http://www.dakkadakka.com/dakkaforum/posts/list/280690.page
personally, I wouldn't use the mekaniks unless I had several ranged warjacks. In place of them I would either add more men of war (especially in the first list), or I would add something that could help the rest of the army stay alive (grey lords casting on Demo Corps) OR I would add diversity and take the widowmakers instead.
oh, and if you don't have Beast09 yet, and you want to run Butcher, I suggest you get it. It works INSANELY well with reg OR e butcher.
epic-----reach+ravager+Beast09's imprint is amazing!
reg-----reach+thresher+feat is amazing!