Dayton BR-1 help. Have only cabinets and want high efficiency build

So... I have lost the components box to a set of Dayton BR-1 and have only the cabinets and the foam. I'm a speaker building newb and usually only go for headphones but I would like a pair of high efficiency monitors for a desktop setup. The amp that I will use is the Bottle head S.E.X. 2.1 I would also like to keep the crossovers external but that's not a must. I can put together a crossover but would love a PCB if possible. Can someone recommend drivers, tweeters, and a crossover?