Should I consider the ST-10 to run from my Yamaha RX-A700 receiver or would the IDA-16 be a lot better?
Using your receiver with ST-10 is a bad choice because you are not fully utilise the performance of ST-10, it should be paired with high performance DAC.
Using IDA-16 is overkilled for your need.
The $995 IDA-8 that will be shipping in early June is perfect for you. This is a new design that is jaw droopingly good.
I am still working on the description and spec, but this is what you get and nothing else in the world can get to this at this price level:
100Wx2 @ 8Ohm (your speaker has relatively high efficiency and this is more than enough)
THD+N = 0.0015 and SNR at -135dB (shocking!)
IDA-8 combines an ultra linear class A input stage with class D power stage in a new design to accomplish the richness of high-end class A sound characteristic with speed and dynamic of class D design. And it comes with state of the art DAC (less input than IDA-16).
It is specifically designed for people who listen to digital music and streaming music. It makes ordinary speakers sound amazing.