They seem to have a good rep, though I don't know anything about that particular model. Regarding capacity I'd guess yes, but don't know - however this
power supply calculator seems comprehensive & is well recommended.
When you posted earlier you did ask about a psu specifically for the Antec 900, but just in case anyone is going to make a suggestion that isn't familiar with the 900, it's perhaps worth pointing out explicitly that that case (like most/all? the antec cases) mounts the psu at the bottom, so sometimes reaching the cpu power connector on the mobo can be a problem, especially if you want to cleanly route the cables.
Is this as likely to be a problem with a psu in the 50+ukp range as with the cheaper units?