Dont buy the MS2000 , grab yourself
a Korg Radias for a bit of extra cash , looks like you are not worried about spend so add yourself a v-synth to the mix and you have a very capable studio for sound creation.
If you want beats take a look at Native Instruments "battery" , it's a really amazing piece of software. I loaded it , looked at it and thought "wtf" because it has a completely unique interface but it's great at what it does even though it was a bit steep on the learning curve.
The V-synth will make sounds you'll never hear on any other keyboard. The Radias is very versatile and clean sounding , the Virus-ti is amazing also but in my opinion not really needed if you have a radias OR have to have the "stereotypical" virus presets for trance , dance.
Korg Karma is a pretty interesting board too , i use mine alot. Check it out on Korgs website.
The Alesis Andromeda is another amazing board but say goodbye to your social life if you buy that because the only way you'll walk away from it is being dragged while screaming , or do what I do and fall asleep on it!
I had the Nord and sold it, it's capable of wearing many hats and is a total performance synth but I had to sell some of my gear because in all honesty I dont use some of it enought to justify having it.
The V-synth is and always will be my favourite.