Booking Austrian train tickets

[zag]

Does anyone have any suggestions for booking tickets & seats for a train in Austria ? I have looked at the OBB website, but so far all I can do is get it to price up a single and I am looking for a return. The trip in question is from Salzburg (airport, ideally, but there is no train station there) to St Johann in Tirol.

I know I could try it via db.de or thetrainline.co.uk, but it would make more sense (or so I thought) to book it directly with OBB. I had thought of going in to Abbey Street to see what they would come up with, but based on recent postings here I didn't fancy my chances of getting a result (or value).

Any suggestions for the best site to try ?

z