I started out with a Mopho desktop, it's like #300 or something. It looks beat up bad. Over time I collected more, as people sold them to upgrade to newer synths like the Prophet-6. I don't recall what the retail price for the Mopho was, I was hoping to get a Prophet-08 some time but I'm not rich and now it's discontinued, but they have a Rev2 coming out.
Compare a Mopho to a Moog little phatty and a Korg MS-20. Well, they are 3 completely different things. The mopho is the most versatile, has the smooth liquid-like sound and just sounds great, is the ultimate techno machine if that's your thing. Moog has the fire in it, has that 'moog' sound, but the little phatty isn't very flexible but it pushes out devastating bass. The MS-20 is squawky and it's high pass filter makes it 'that sound' you want to push up there, and is more something that falls out as you tweak it rather than any kind of plan you had with it.
What I really hope is that they will make a Prophet-6 mono synth.