RRP $799
Regular price: ~$600
Regular sale price: ~$500
Seen it as low as $401 on an ozbargain search.. $345 a new low?
Don't forget SB/CR for another 3.5% / $10.97 cash back.
They're probably price matching Harvey Norman sale, if you'd rather buy there for some reason.
Your Dali's require 40-150W @ 6 ohm (I assume per channel).
The Yamaha amp specifies
—- 80 W per channel (6 ohms, 20 Hz-20 kHz, 0.09% THD, 2-ch driven)
—- 115 W per channel (6 ohms, 1 kHz, 0.9% THD, 1-ch driven)
—- 145 W per channel (6 ohms, 1 kHz, 10% THD, 1-ch driven)
So you should be fine with something like this amp.