There is no all in one hardware worth getting for serious production other than a Mac or a PC.
In terms of synths, I`d trawl the second hand buys on ebay, hardware prices are dropping as people abandon them.
V Station or K station
A Novation drum station
Juno 106
Yamaha DX7
I think you can get old sh101`s for good money now
of course you will then need a good mixer.
I`d probably go for mackie unless you have a lot of cash to throw about.
Then you will need some good compressors, and maybe some fx and multi fx units.
Also some nice monitros, I`d recommend fostex PM-1 really good for the price.

Or just get some really good control surfaces, and buy a soft studio.