It is cheaper and more flexible to buy a Nord Stage 2 SW ($3,600 USD) and a cheap(er) weighted board. Getting a Nord Stage 2 you can do all the things the combination of NP2+NE4D can do and much more. (you can have two piano sounds, a piano and an organ, two samples, etc). Sure, you have to program on advance and consider all the real estate, but that's the reason you'd get the other weighted board, to control the "piano" sounds.
Options for the piano weighted keyboard:
- Leightweight and sound flexibility: Casio Privia PX-5S
- Best action: Kawai MP6 or even the Kawai VPC1
Personally though, if I was going to gig, I'd take the Casio Privia PX-5S because of its weight and sonic power. It is also very capable on its own and is suitable for those gigs you do not want to risk your pricey Nord Stage 2. BUT for studio use, I'd take the Kawai VPC1.
On the money side, if you choose the Privia, you save up to $600 USD compared to NP2HA+NE4D. With that money you can get a good small format mixer and an ok personal monitor, if needed.
Saludos,
Gustavo