for me, I'm very happy with any jamming studio that provide 88 keys .. not necessary to be a high-end synth, but a digital piano 88 keys weighted, and maybe a synth.
That'll be plenty for me to work with .... in any case, i just need the digital piano, cuz usually i bring my own synth ... =)
ps: but honestly, very few studio will provide digital piano ... so even an X50 will be sufficient for me, not entirely satisfied, but happy enough to go to studio without bringing anythin =P (imagine the weight that i need to bear if I need to bring my synth everytime)
Agree with cheez Workstation is not needed tho...