Hughes has got off to a great start, he should be able to average around 50 in Tests.
His first class average is well over 50, and that should give you a rough idea of what to expect in Tests.
He is only 20, he may not improve to Bradman like levels (but seriously, who will?), but he should be able to at least maintain an average of 50 for the rest of his career.
Oh, and aussie_ben, can you please stop going on about Hayden, I know you are only doing it to be annoying, but people are tired of it, it was funny for a while, but now you are flogging a dead horse.
As for Sehwag, I don't know why people call him overrated. Are there some official ratings somewhere that give him a 90 when he should in fact be rated as an 85?