Elektron Musical Instruments

I am considering either a monomachine sfx-6 or a machinedrum.  Here is 
what I already have in the way of synths and drum machines:

Moog Voyager
Korg Triton Pro-X
Korg Electribe ER-1

I was really looking for more electronic drum sounds, and thus considering a 
Machinedrum.  Now I see and hear what a Monomachine can do in the 
percussion department along with everything else it does.  I am very intrigued 
by the Monomachine.  Eventually I would like to get both, but for now only 
one.  The price difference is not an issue, nor is the fact that the sfx-6 is now 
limited.  I just want to hear opinions about their functionality and sound. 

I started out just looking for percussion sounds, so should I just get a 
Machinedrum, the kingpin of electronic drum machines, or should I jump in for 
a Monomachine that does some good percussion and a whole lot more?  
Considering the gear I already have, what would you guys do?  Thanks.