I have always wanted to hear a Lake People amp. It looks they have just announced a new flagship, seen on their thread here.
I have enjoyed my HD650 from every amplifier I have tried. There have been some fantastic recommendations in the last few pages. I personally have enjoyed them most from my La Figaro 339, Eddie Current ZDS, and balanced out from my father's HA-1. Valhalla 2 was also great synergistically, and I may be in the minority in liking the O2 pairing as well.
The WA6SE looks like a great option (the most attractive to me from Woo), though I have not tried it. Sorely missing from my experience has been the Crack, which I have only heard briefly. Other options I would consider might be the FA Elise and the Garage amps. Too many options really. But your preferences do matter. My intuitions tell me that first stop from an entry setup should include a Crack w/SB, universally praised as securing a brilliant synergy, and for a ridiculously good price. I would not spend thousands, unless you knew you wanted to max the hp, if ever. It was only until I had lived with this lovely companion headphone for seven years, deciding it was my favorite, that I began saving for the ZDS. The 339 honestly gets very close for me, but if you were looking for the Valhalla 2's bigger brother, with a relatively neutral yet luxurious timbre, notable macrodynamic slam (particularly on high gain), deep and textured bass, and high sensitivity to microdynamic nuance, it would probably be the ZDS. The 339 is highly tunable with tubes and is more immersive than the ZDS. It also slams hard yet is slightly slower due to higher OI (note that the lower OI of the Valhalla 2/ZDS make it sound faster). Its highly textured and spacious rendering of microdynamic modulations of detail goes toe to toe with the ZDS, and the amp has consistently wowed me more than any other amp with the HD650, even if the ZDS is more transparent and allows the HD650 to exhibit more solid, impactful bass (which is the weak point of this hp compared to planars).
I am still using stock cables after all these years but did use a Norne SolvX balanced with the HA-1 and a Cardas cable for awhile. My HD650s have the silver drivers but came in the silver box.