zfigz
4
I highly recommend going for what you can afford.
If you find a mk1 for cheap, I’d go for that just because it gives you the essentials (sequencer, most synth type, etc). Using custom waveforms with mk2 is pretty fantastic. I had the mk1 until the end of 2012, and ended up having to pay an extra $100 (after selling my mk1 for $600) to upgrade.
While I’d like the +drive, I really dont see it as necessary unless you either don’t wish to backup via computer or are looking to store loads and loads of waveforms.