i've owned 2 sidstations - both with diffrent types of sid-chips in them.. i loved 'em but had to sell 'em because of moneyproblems
and i've owned a Machinedrum which is also really nice (even if i didn't make any drumloops with it - mostly used as an synthesizer
)
if your into the sid-sound check this out then:
www.hardsid.com (4 sidchips = 4 sidstations on one soundcard with an easy to use editor and so on - i was going to buy one but my computer broke down and since i haven't got a computer to put that one in)
I just love Elektron's stuff - and the monomachine will probably be really odd but cool too - but i've heard that it will cost ALOT..