While I haven't actually watched it yet (as it just shipped a day or so ago), I'm eagerly anticipating getting "Remembrance of the Daleks" as I hear it's one of McCoy's best stories and the point where his era becomes good. Though for me that will probably mean it will become really great, because I've loved all of McCoy's serials up to this point.
I just read the novelisation of that, it's a great serial and has a few Dalek firsts in it.
It's one of my favourite McCoy stories, plus Ace starts to become womanly.
I just listened to the Crusade which felt like it was trying to recapture what made Marco Polo great but didn't really manage it.