a short list of your suggested android alts.Ken ... is a great idea ...
(although for myself...I have just about had my fill of android...and am waiting for the zerophone to hit market now...and will be making my own pi-beast this winter....below is my list of bits I am going to buy and put together....)

- pi 3 model b (of course)

- a 9 layer transparent case (perhaps add a layer or two if needed...)
with a 3.5 resistive for the top
http://www.ebay.ca/itm/172855095066?...84.m1436.l2649

- a fan (needed for what is going inside)

and for the guts ...

- a mobile power board
http://www.ebay.ca/itm/232340038249?...MakeTrack=true
(my expectation for usage of battery is purely for calls when not plugged in....)

- a 4 band gsm board
http://www.ebay.ca/itm/112537391335?...84.m1436.l2649
(I may consider the newer 900 instead of the 800)

- and the audio injector sound card
http://www.ebay.ca/itm/182655173758?...84.m1436.l2649



i was originally favouring and considering the wolfram ...a stellar product..
http://www.ebay.ca/itm/231408301175?...84.m1436.l2649
but after enough research ...
Their board is definitely out as an option. ...
pitiful pitiful..
its lack of support is astounding...
their forum is full of people asking " what happened?"
with the current pi's ...nothing but probs... ..or rather the lack of proper support for their product
(which I find amazing ...sell a product and DON'T support it???? Really????)
it's like wolfram made this wonderful product...than then afterward decided to completely forget about it and ignore it...
..to use a Trumpism ".....sad...."
So yeah...
Not interested in a luxury car with square wheels ...as the saying goes...

and I briefly considered audio injector's octo
http://www.ebay.ca/itm/172755847976?...84.m1436.l2649
but decided that was overkill and would make portability a possible issue....

I just need a decent audio card to continue puttering with real time processing ...so I can continue using gtkgep and other such fab progs. with a decent portable system and my harps..


There is my intention....
an all in oner that should do the trick