The Bestinone's tested out pretty well in Mitro's test (below). $8 for a pair with free shipping is a pretty good deal. Most IMR's are not protected because they don't have thermal runaway problems of LiCo cells. I have some batteries, but not a Xeno to test them in. I would worry about using an IMR in a direct driven light because it might burn out the LED. Since you asked for the best, the AW IMR's are certainly better, but cost more.
Shaotech sells the same sells as Best In One, but from the US. I'm not sure how much shipping is to the moon.