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This a a tough question, so i might as well muddy the water with another response from an AP newbie.
I've got a dslr and a colour-cooled camera. If I wanted to do just AP I would strangle all I could out of the DSL. As Glen says, there's a lot to learn even with an OSC before putting filters etc into the mixing pot. The I'd go straight to mono-cooled. That will help with LP etc, and you'll get those beautiful shots I drool over down in the 'deep space' section.
I love the cooled colour as I also do live broadcasting/imaging. I will eventually get a mono cooled for AP - something like the 1600. But there will probably be some new great thing by then. I understand QHY have been talking about a new APS-C sized cooled mono camera for a while. They are debayering some colour sensor ?
If you go with the cooled OSC you should also consider QHY. I have the ZWO ASI071 - its a great camera but it has an issue. You need a computer with USB3. If you only have USB2, reading off the camera is slow and you get amp-glow (it can be removed with darks but that's not ideal - its in a cloudy nights thread somewhere). I believe the QHY doesn't have this issue as it has a sizeable onboard memory buffer.
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