20g is nice. I have a Benelli M2 in 20g that I use for all my shotgunning (apart from clays - 12g for that...). With a 26 inch barrel, its nice and light and quick pointing. Little felt recoil as well. I went into the shop to buy an ATA 20g and ended up with an M2...
The smaller gauges could be a waste of time I think. Unless you are a really good shot, not that much will fall out of the sky, which could become a little disheartening for someone starting out. I guess the flipside to this is that there is less recoil as you say, so the kid will be more inclined to want to shoot it...
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