[EDIT] Just realised hydrogen posted youtube links above, didn't see those initially.
NO worries bro, my post was definitely biased against using the actual dx7
... Have you tried oli larkins virtual CZ synth? it is pretty amazing. http://www.olilarkin.co.uk/index.php?p=virtualcz
Yes I have it and go to it quite often. I'm fond of it for chords, there's a sound to it that I find lies somewhere between an Alpha Juno/Poly 800/DX'ish that I really like. You can get some 'Detroit' style deep chords going on with those envelopes esp on pitch. I also have the Alpha Juno 'Redominator' plugin but for stuff like the above, Virtual CZ hits the spot for me.