Go for a second hand 5D. Should save enough money to invest in new glass also.
If you are actually making your money from photography, go for the mkII or if you REALLY need the video rec then go for the new version.
No point in a 1D or 1Ds since you will spend more time setting up your Cfn's.
I still shoot with a 5D classic and price vs performance (especially now). Nothing comes close. I wouldnt even trade a classic for a 1Ds.