As far as shooting for lower abv, there is of course a bunch of ways to go about it. I personally lower my initial honey amount, and ferment dry, simply because dry, still mead is more my taste.
By using ale yeast the yeast poop out at a certain abv, which leave the remaining honey unfermented and thus a sweeter mead with the same abv. The only problem with this is sometimes the initial amount of sugar in a mead must is so high, the ale yeast might be shocked and not able to get a foothold and start fermentation. There is a technique to start out the must with less honey, let fermentation start, and then add the remaining honey over time to slowly bring up the abv. This is a bit labor intensive, but i've heard it works.
So it really depends upon taste. If you and your fiance like sweeter meads, go for about 2.5 lbs of honey per gallon of water with a beer yeast that ferments clean, maybe even a lager yeast (personally have never done this, but its on the list of things to try in the future

), with a healthy dose of nutrient. If you like dryer, still meads like a white wine, use the same amount of honey but use lalvin k1-v1116 or something with a similar alc tolerance to ferment out dry. I've been experimenting with different types of wine yeast for mead, but since it takes so long to age I don't have any real data yet. Maybe someone else can pipe in here.
Again congrats, and thanks for the wishes kid. Hope she likes it, I have a special bottle that will be approx 1.5 years old by our wedding...I call it liquid panty remover
mike