Korg DW8000, Mono/Poly, MS-20...

Hi, i'm new to the group having just got hold of a Poly 61 for £100.
It's far simpler to use than i thought it would be and although it's
quite funky, i'm having trouble getting the timing of the arpeggiator
to get anywhere near the tempo of my tracks!
I was torn between this and the poly800. But i had heard the poly61
had a more "analogue" sound but unfortunately no midi.
Having seen and read all about the various mods done to the poly800,
ie the "moog slayer" mod, i was wondering if anyone had tried
something similar to the poly61?
Aren't they very close in terms of design and sound generation? 
I'm considering opening her up and having a look!

Thanks for any help you can provide.