5D for me,...in fact, I already turned down a 1Ds for the brand new 5D.. Another thing,... you should also mention that the 5D has the advantage over the 1Ds in iso range.. 50-3200, more control over user shooting styles, better battery performance, lower costing batteries, more quiet shutter, lighter weight, much smaller size without the grip, with a brand new Canon waranty....and is new technology. The 1Ds has already been outclassed, and can't be sold for what the new price of a 5D is,...and it was not that long ago that it was going for 8,000.00 ....so, unfortunately,...that really stinks for 1Ds owners who would want to "up grade" to a 5D.
Oh well..
JP