Ted, I've been using Ketron modules (MJ, MJPro, SD40) for quite a while now and the MJPro is almost perfect for me, however there's some features on the Korg that I need (TC Helicon, more realtime buttons, etc). I travel locally and overseas once a while and I need a compact, portable rig that I can carry on with me on flights. I love the convenience of an all-in-one AKB but the weight and size is becoming issue for me plus the hassle of taking them on flights.
My main rig now is a Ketron MidJayPro and Nektar Impact 61 key controller. I'm a minimalist and had considered the BK-7m but you need to add an external vocal processor/harmonizer and external display to show lyrics.