Sell your camera and wait. 5D Mark II is overdue for price drop. With Nikon D300s putting pressure on 7D maybe it will drop price too. Nikon is now $120 less than 7D. That immediate price drop on D300s made me study the D300s specs. My friend, who works at camera shop can now buy D700 for $1999 new, & D300s $1,300 new through nikon's "employee purchase program". Once Nikon clears out D700 at better price to camerastore salespeople they then drop price to everyone so we're closer to seeing D700 at $1999. That'll also make 5D Mark II price drop, I'll guess
Hmmmmm, I see a Price War on horizon...
I like my 5D Classics, however I've never read of anyone that owns 1Ds bodies who's been wow'd by 5D Classic images. There seems to be a bit of fairy dust added to 1Ds files, so I've read.
I suspect when 5D Mark II finally sheds launch price my classics will shed value too. Seriously used examples just break $1,000 thesedays.
I'd like to wait for 5D Mark III or popular rumored 3D, a digital Eos-3. That would be cool. I recently realized I can add my 2x TC II to my 300mm f4 IS and get speedy image stabilized autofocus with Eos-3 film body. Autofocus at f8 function only reserved for only 1Ds and 1D dslrs.
If you only need one camera, sell your 1Ds Mark II before it drops more resale value. That 1Ds Mark IV is so close to getting announced, or so it seems. Once everyones bought their $5,000 1D Mark IV, then Canon can launch the next $8000 body.
I assume you know the current 1Ds Mark III runs $6115 at B&H, almost $2,000 off original list, and $1,000 off adjusted list. If Canon's next flag ship full frame comes in at $6999 then that will also depress resale value of your old 1Ds Mark II.
Canon EOS 1DS Mark III Digital SLR http://www.bhphotovideo.com/c/product/518204-REG/Canon_2011B002_EOS_1Ds_Mark_III_SLR.html