Great combo... tough i would go for the 88 key version..
the 88 keyversion has got a TP40 keybed, which is much more hammer action/piano feel, the 76 key version has a TP100 which is more like a trade off between semi weighted keys and hammer action..

IF you just want to use the arranger as external device and no other modules nor a laptop with VST's... the Nord stage is excellent..
you can set up external channel A for left hand and channel B for right hand and never look back.. this way the SD40 feels like the perfect part of the nord..

In my case, i would go for the Kronos or even better a montage (or even a modx8).. because i also want to controll other modules and VST's with it at the same time i use the SD90... and they are just better suited for that as they have 16 channels for assigning anything you want to it..


Nevertheless i love the idea behind this..