the Asrock Mobo is here for a fair bit cheaper than you found :
Product list
I bought the slightly cheaper Asrock one from that page, the 720 model and it works well for me. I haven't tried too much to get Speedfan to control the speed though but it didn't seem to work first go.
If the Asus board works well for you in all aspects except the fan noise, why not just by a three port fan speed controller? You can get these for a lot cheaper than the cost of a new motherboard (well, not much cheaper now that boards have dropped in price so much).
Anyway, I think that is probably a better option than buying another board that may not be suitable either.