Please note the TA-30 is a Hybrid amp thats still Class A but its tube input solid state out. [Super smooth solid state thought its incredible].
one thing really going for the TA-30 is that it can be used with E80CC tubes. Which really make it something magical.
Current setup is a little north of the 500 mark and I find it does the Sundara quite well, though I have no idea if this is ‘the best’ they can be.
I own and love the Sundaras. For me they are turning out to be very versatile. I am running them with the SMSL M200 DAC and 2 amps - The SMSL SP200 THX amp and a new addition, The XDuo TA-20 balanced Hybrid Tube amp. This gives me great sound options depending on the type of music or mood I am in. It’s fantastic, man!
It’s really interesting how the M200/TA-20/Sundara combo is performing. It’s exceeding my expectations by a large margin. The AKM implementation in the M200 is providing excellent precision and detail, which then gets caressed by the tube and sent to the Sundaras, balanced the whole way. Live music is outstanding on this setup. I have some very tasty live music going on this thing right now and it’s frickin great. close your eyes and you are there. Having lots of fun with this.
I see we have another fan of power into a Sundara 
I saw a post not so long ago where somebod was driving it with 70mW and complaining there was no soundstage or bass xD