Smart choice, currently I don't have a Barlow on mine but I want to get one. From some of the people that I've talked with, they say that .5x might be a little extreme and recommend a .7x because it is better for ergonomics and work area. I don't know what to say more than that.
I still think that a fiber optic light is going to be better that any led light, it allows you more light without the bulky light ring, probably why they are pretty expensive though. If you watch eBay for a few weeks, you'll see scopes listed by people who don't really know their real worth, they usually have bad pictures and descriptions but then you can swoop in with a low bid and grab it. It's poor marketing working in your favor...
Good luck.