Angoras are a lovely breed. I got my first ones two years ago and when I first got them there was some problems with some of the feet. However I think that was because they had to be kept separate from the rest of my herd until they had had their CAE accreditation tests so wintered in a field which was wetter than I would have liked. However, since then haven't really had any problems - the only thing is the feet I have found are easier to accidentally trim too much off the sole and make them bleed.
Ours have been fed a goat grower finisher - I agree they need hard feed all year round. Also in order to prevent contamination of the fibre you need to think of a way to feed the hay rather than an over head feeder. I note at shows people have used large gauge mesh bend into a circle about 3ft high stood on the ground.
They need shearing twice a year - this is harder than it looks but not impossible!
There is a good group called
http://www.angoragoats.org.uk/ Welsh and West Angora Goat Club