Re: Propane or alcohol
we have the Oringo 6000 and are working on converting to propane.
For stove top cooking they are fine (though a little slower due to lower temps) but trying to use the oven sucks. Very hard to maintain a consistent temperature over a period of time. (and because of the way ours is installed, very hard to refuel) ...Wife has avoided all baking with it, which she misses. thus the conversion.
If you don't need the oven, then alcohol works fine, but at this time the cost to operate is more than propane.... but if you are converting, that cost buys a lot of alcohol!!!
For us the expense is going to be justified by including propane bulkhead heater....
So it basically boils down to what is preferable vs what it is going to cost...only you can decide that.