@The Angry Hen
I concur with what has been said about commercially bred White Leghorn layers.
They are laying machines, for the first 2 years, and then generally beset with problems which the commercial industry avoids by culling at 2.
They tend to be flighty and cantankerous in my experience, but that was a while ago.
I would not want to breed those big floppy combs in Maine, I would definitely go to the rosecomb variety.
I would also get my starter flock from a reputable breeder. I would go towards the Brown Leghorn or Red or even some of the fun pattern like Exchequeur....that gives you color pattern OPTIONS!
Well bred breeder quality Leghorns will still be better layers without the nasties of the commercial lines, which sadly are bred almost solely for quick production. I'd stay away from the production lines.
And unless you want white birds, I'd not breed from the dominant white of the White Leghorn...I personally like variety and color in my flock, but further, that white is a predator draw in my area. Hawks do pick off my lighter colored birds.
You won't get meat off a Leghorn, but if you want pretty, and prolific, you can't beat one.
to show you the variety of all those pretty colors OTHER than white...
http://www.feathersite.com/Poultry/CGK/Leghorns/BRKLeghorns.html
LofMc