Nick,
Actually I would be leary of option 3. I have option #2 in your list installed for about 2 years now and while it costs more, the stock button module with the volume buttons to control the parrot do not work as well as you would think. In fact I recall responding to another poster, I think over at VWVortex that was having no luck with the volume buttons at all.
IMHO I would not get the parrot CK3000 setup without the new button module, unless you plan to install the actual parrot control module as spock has done. Both the CK3000 and 3100 come with a control module, the 3100 adds caller ID. I believe the kit that 1stvwparts sells may not include it as it is intended to be a complete hidden installation, but I may be wrong.
I also can confirm no display information, but I have voice dialing on my MS smartphone and it announces the caller or number if I do not have the number in my phonebook. It works well enough for me and I too prefer the clean integrated look over the addition of a module on the dash.
To each his own is what it boils down to on this one, but remember Spock made a really good point and that is if you go with the CK3100 you will get the Caller ID display and that is something worth seriously mulling over if it is important to you.