Did a search, but I don't think anyone's done this kind of comparison.
For my "wide" shots, I am seriously considering going full-frame. In addition, both my 24-105 and 70-200 are weather-sealed, making the 1-series attractive because the combination is fully weather-sealed.
Money is always a factor. I don't want to break the bank! I have about $5k invested in my gear (sig) and don't want to spend a ton on a second body. Love my 40D, but like I said, weather-sealing and easier "wide" options are what's driving me to a potential full-frame.
Factoring in cost and image quality, what do you consider the best price/performance option?