Personally I'd go with the Aquaero 6.. It's due later this month I beleive..... Look
HERE If you haven't already for more info, It'll probably do most of what you want with the single Device & a couple or so 4 pin splitters e.t.c.. You could if needed use an Aquaero LT as a slave device connected Via the 4 pin Aquabus to the Aquaero 6, How this works is explained in more detail
HERE and although this guide I did is for the Aquaero 5 I'm assuming it will work the same with the Aquaero 6.... Hope this helps
N.