If you wanna see and feel big & heavy buy a Roland G70
Yeah, G-70 is a great keyboard, buildt as a tank and heavy duty,
I regret I sold mine a couple a years ago, same as SD1. Miss both, but still cannot stop dream about a Technics/Ketron mix.
Techtron or Kethnics mix would probably blow the rest away......
....or maybe not.
But to at least be able to play all my Roland styles as well as "best of Roland" stuff enclosed, I bought a BK-7m w/FC-7 at local eBay tonight.
Hopefully it will work well connected to my Akai MPK61, KMA or even T4.
We'll see when it get here...