I have seen the 1Ds II on Craigslist for around $1700. That's a very tempting price, considering how much it was when new, and is cheaper than the 5D II used. It was my dream to own one of this beasts, but the cost was way out of my reach. What I am afraid will happen is that once I got the 1Ds II, I will be thinking about the 5D II. The high ISO capabilities, the video, the smaller form factor and portability. But, I like the 1Ds II too. It shares the same batteries as my 1D IIn, same image quality as my 1D IIn that I know what to expect, which to me is acceptable even at ISO 1600. I also like the fact that is a Canon made cross split focusing screen for manual focus lenses, not to mention it works with more manual focus lenses without hitting reflex mirror.
Perhaps I should just shoot with the NEX-5 for another year or two, exclusively, and who knows what kind of revolutionary products may be introduced in two years? OK, that's an excuse, but I just can't decide.
Swirling Effect -- NEX-5 & Astro-Kino 65mm f1.5 projection lens. Click to see larger.