Rain you will not be sorry investing in Wavestation. And please don't think it is only good for spaced out complex evolving textures. It is full of bread and butter patches that also sound incredible.
But I must admit Wavestation is one hell of a synth and really there is not much out there that can do what it does. I fell in serious love when I first heard the hardware. Like the M1 you get all the RAM cards and all the internal memories that were around at the time. You can work the joystick and record all its moves too and play them back. That is when things start to get interesting.
Do me a favour when you get it
Rain go to Rom 11 and select sound 1 'Deep Atmosphere' you will fall over when you hear it!
I do a lot of complex ambient stuff and really it is an essential synth for that. But there are tons of normal sounds in it too. It also works as a stand alone very nicely so you can just audition patches and have fun with playing with it that way too.