Consider Duelund oil impregnated cotton covered tinned copper. Use 16 AWG if speakers are reasonably sensitive or 12AWG if not. These definitely and fortunately sound best when not terminated. So no worries or concern about expensive Rhodium, Silver or Gold banana plugs or lugs.

There is no need to match lengths of left/right speaker cables. With the money saved on not needing terminals perhaps order an extra 2M or so of 16AWG and some KLEI Copper Harmony RCA's and build a pair of interconnects. On sale at partsconnexion for $38.47/set of 4. This is a lovely combination. I am slowly replacing my expensive Furutech RCA's with the KLE units.

An internet search will provide tons of rave reviews on the Duelund DCA 12 or 16GA. Try reading Jeff Day's long rambling review for fun.

hificollective also keeps stock.