Stump,
Sounds like you plan to do a lot of hunting at dusk and dawn with that setup.
Don't know what type of hunting you are doing.
Just my opinion, I believe a 40mm or 32mm scope is fine for most purposes, they will provide plenty of light for 99 percent of your needs in the premium scopes you are describing. If you don't mind the extra weight and cost, go for it.
The Leupold III is a brighter clearer scope than the Burris Fullfield.
I believe the comparable scope in Burris is the Signature series, but they are much heavier than the Leupold.
I personally would not get the illuminated reticle but if it allows you to shoot five minutes earlier or later in the day and that is the five minutes in which you find your trophy then it may be worth it to you.
You would certainly not be handicapped with either of those choices, both nice scopes. Good choice on the magnification by the way.