Which of your two bodies produces images that you like better? How's the IQ compare? Personally, I prefer the 1d3 to the 7D, which will be apparent when you read the comments below.
Get the 1d4 and ditch the 7D. AF is better, images look better, you still will be able to ignore the video feature, dual cards and the same battery as your 1d3.
You don't hear people talking about battery life on these things much but the LPE4 battery lasts forever for me on my mk3. I got 5k shots out of one charge in July. 3k is normal.
You might wish to consider a 5d2 instead though (same battery as the 7D, so the reverse argument would apply). People rave about the files; I've never tried one.