What cables for luxman

From what I've read of others who know more than I, balanced cables will offer no real advantage with that short of length. RCAs should be fine.
As for what type/brand, there is so much here already that a quick search will lead you in the right direction.
My experience is that you don't have to spend a fortune to get great cables.

Good luck!

PS: I'm a bit jealous of your gear.

I had the Luxman L-505u for less than a year and I used the Nordost Red Dawn's XLR with my cd player and the Bis Audio Cuivre-S RCA from my phono preamp to the amp. Appart from the gain which is higher with the XLR, I found no advantage with the XLR. Both of these cables are neutral and similar.

For the speakers, it was Van den Hul CS122 with great results combine with a pair of Harbeth SHL5.

Sebastien

Based on discussions with the importer, Shunyata seems to be a favorite. Not just power cords, but IC's and speaker cables.