Another option to consider is a spare wheel mount fitted to the front. I have done this, and there are some positives and some negatives.
I fabricated an adaptor bracket for the standard LR wheel mount to the ARB bullbar. Temperature was fine around town and slogging through the Simpson, but highway speed above 90-95 caused it to sneak up. Great height to lift tyre on and off from. Extra protection from aminals as well perhaps! Visibility was virtually unimpeded. Approach angle would be compromised in some situations, but wasn't an issue at all in Simpson. Centre of gravity remains nice and low.
I didn't want it on the roof rack off road, as we had a bit over the 75kg limit with tents, chairs & other camp gear there as it was. On the way home I did put it on the roof rack, so we could cruise around the 100kph without concern.

