Bruce, I concur with Bayden's 3 listed choices–MSR, Snow Peak, and the expensive Jetboil. You want as much propane as you can get, with the rest being iso-butane. This works well in temperatures down to freezing, and a bit below that (probably down to 20* F). N-Butane is a useless fuel below 40-45* F. However, if you know the temperature won't get below 50* F, then the cheaper Optimus canister is a good option. I have't used Coleman's canister fuel, so I know nothing about it.
I don't know about all the brands out there, but here is a summary of what I do know:
Jetboil: 25% propane, 72% iso-butane, 3% n-butane. The problem I have with Jetboil is that their "110 gram" canisters only contain 100 grams of fuel, the price is the same as MSR's. The other brands give you the full 110 grams. The funny thing is that Jetboil gives you 230 grams in their "220 gram" canisters (MSR and Snow Peak give you 220 grams)
MSR Iso-pro: 20% propane, 80% iso-butane
Snow Peak: 15% propane, 85% iso-butane; They are usually priced 10% lower than the MSR and Jatboil canisters.
Optimus: 30% propane, 70% n-butane. It is much cheaper than the above brands.
The prices here in Boulder are as follows (per 110 gram canister, not including sales tax):
Jetboil–$5
MSR-$5
Snow Peak-$4.50
Optimus-$4
I myself use MSR and Snow Peak. Sometimes when I can't think of anything to buy with my REI 20% coupon, I'll snag a large canister (220 grams) of Jetboil. It might well be the best fuel mixture out there, and I get 230 grams of it at a 20% discount. I usually just use 110 gram canisters when backpacking though.
I'm anxiously awaiting my new Coleman F-1 Powerboost stove, thanks to you.