A southern gardener could probably give better advice, but I'd leave the leaves on. I think they usually hold onto leaves all winter when they are growing outdoors in warmer zones.

I saw a combo pack of un-named amaryllis and crinium bulbs at one of the warehouse stores.... I was very tempted by the bulk pricing but then remembered my 2011-no-more-amaryllis-purchases rule. hmmmmmm.

I have some here that stay out through the winter where our lowest temperature is about 26 degrees for three or four times a year. They keep their leaves through the winter, where the Hippeastrum do not, at least in our temperatures. Our total rainfall is in the winter so they never dry out. When the weather warms and they start growing I would feed them. Al