Actually, because of the current sale and the available Ali/seller coupons, it's cheaper to buy Pro 82 and Idea the normal way, without the Head-Fi discount.
Aliexpress offers a 5$ off 35$ coupon, valid until May 12th:
https://sale.aliexpress.com/country@US/__pc/New_Fashion_Arrivals.htm
After this discount, Pro 82 v2 is only 53.85$!
https://www.aliexpress.com/store/pr...g-game-stereo-headset/314156_32808454492.html
Idea is 66.5$ after the 5$ Ali coupon and "5$ off 69$" seller coupon -
https://www.aliexpress.com/store/pr...E9018Q2C-DSD512-32Bit/314156_32809153098.html
Unfortunately, the 5$ Ali coupon can only be used once, so if you are buying both, here is a "2$ off 15$" Ali coupon you can use on one of them instead:
https://coupon.aliexpress.com/getCoupon.htm?p=poWHYrSQuRVEmLmRxLZkq098EW2XYI19XyiTpo3cJwj1s2k4Z/H9Cw==
I don't recommend DX3 Pro, because I am not a fan of AK "Velvet Sound" - its sound is "smoothed", like you wrote
EL-D01 does sound harsh on its own, but it sounds
magical with P10
It's a tough choice, but considering that P10 is the same price as usual, and seller offers no coupons - I'd go with the Idea, which will also play many formats EL-D01 can't.
You can always buy P10 later, just like the 99$ B-stock O2 - so you'll have two synergy combos, each one offering a different sound!