I was planning to buy BTR-7 for IE400 Pro on phone but was wondering if can get reasonable performance with BTR7+laptop+Z-906 as well. Read that BTR7 doesn't have line-in/out but would that be a problem for driving the Logitech ? Or maybe do you have recommendations for reasonable upgrades over...

V10 sounds nice but not sure if I can find here,.even higher models are hard to find. Another point is that bootloop problem and the infrastructure required. I have V10 in mind but seems like it will be my cba anymore pick.

I assume G6q, G6+, V30, G7, G8, V40, V50 each have the same DAC ? How do they compare with V10 and V60 ? Even this kinda feels overwhelming, should I just get a A306 or the FiiO DAC mentioned above ?