Try asking Idealtech: https://www.facebook.com/IDEALTECHOLOGY

1. Do you have a pair good headphones/speakers?  No point getting one if you have cheap speakers/headphones and pairing them to a good soundcard would be a waste. Ensure that you have high quality audio source (preferably lossless audio such as FLACs) or else your audio setup is not going to perform to the fullest.

2. 802.11ac requires a compatible router.  If you do not have one, then having a wireless card supporting 802.11ac would be a waste.  You will need to buy one if your existing router does not support 802.11ac and routers supporting 802.11ac speeds are not cheap (the cheapest one would be ASUS RT-AC56U, costing at RM639). If possible, just stick to wired setups since they are very reliable.

Do you have intentions to overclock the CPU?
BTW, you have one heck of audio setup out there.