I've been doing NiceHash X13 since they introduced it. It seems to be much better than X11 so far. Also they have the multi-algorithm switcher that seems interesting but haven't tried that yet. Both would be good additions to the list if you have the rigs to spare.
+1 ... suchmoon, if you need any help with multi-algo, let me know.
The problem with multi-algo is that it's only X11 and X13 essentially, Scrypt doesn't come close, maybe Scrypt-N will kick in at some point. But sgminer5 only works on AMD hardware, whereas the best hardware for X11 now is NVIDIA. That's why I'm not too happy with this approach of being tied to a special version of alpha-quality software, and having a pool-side hardcoded set of profitability ratios.
Having said that, it's a promising concept, and I see TMB adopted it too, so I'll try to put together a few 270X or whatever I can scrape from the bottom of the drawer.