Hey, Pete! I must have missed the reply earlier, sorry!
If I did not already have EZD, then I probably would not go the route of EZD + SD2.0 because of the low cost of SD2.0 now. when I bought it originally, EZD was $149 and SD2.0 was $299! and there was no crossgrade available! but I ended up getting the crossgrade for $165.
anyway - what you would be missing if you got SD2.0 and didn't get EZD:
* an additional drum kit
* a kit that has already processed samples which makes it easy to throw a quick project together without much tweaking.
* the MIDI loops that come with EZD (you still get a LOT)
edited - found that info.
that's the way I see it. so if those things in particular aren't important to you, then I'd just go straight to SD2.0!