It is a decision I can't make for you - if you consider adding more NL devices to your setup, you should, however, have an eye on the11/17/Moment combo imo. Try to learn more about how the Moment works, before you buy it. It is not just a replacement for a BS5.
By the way - with the Moment you can also map the sources to the tv and this way start e.g. Radio with the remote from scratch.
I am sure, that you can sell the first gen Essence. There are always people, who want/need a standalone setup. Maybe your dealer will give you an offer (would be the easiest way to 'get rid' of it) ---- but keep the 'wheely' ;-)
MM