For my new BV 250, I've narrowed the topcase choice to the Givi E370 or the Coocase V36. If I were to get the Givi, I think I would get the AdMore Lighting kit for it, which are about twice as much as the Givi lights, but worth it I think.
(here's a link to see them https://www.twistedthrottle.com/trade/productview/4638)
Pricewise, the Givi and Coocase then come out close. The Givi, with the gloss silver top, would be about $190. Shipping is free. The lighting kit, with shipping, looks like it would be about $145 (ouch!). For a total of $335. The Coocase is $249 (free shipping), and comes with lights. But the mounting plate is extra (about $65 with shipping through Twisted Throttle). Total: $314.
Right now, I'm giving the Givi the edge, because the Admore lighting kit seems to be a much better lighting system. Easily worth $20 more. But what about the topcases themselves? I've read good things about them both. Are they comparable? Anyone who has used them both that strongly favors one over the other?