Almost forgot… how long are you willing to wait to get your light? Anyplace overseas, like GB, FT, BG, AX, etc., you’ll be waiting several weeks to over a month, at minimum. If you want it faster, you need Amazon. They won’t be as good pricewise (like I said, 40bux regular price for an F1 there, vs maybe as low as half that from GB if you’re willing to wait for a flash-sale).
In this case, and I don’t want to sound like a shill for Nitefox or anything, but the UT20 (light-only) and the cell with built-in charger will be all you need to get started. It’s a decent cell as-is, and it works well with the ’20.
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One alternative I forgot to mention is the Thorfire TK18 kit. The light, charger, and Thorfire cell (pretty good) can be had from BG, but dunno if the codes are still good for it. Check the threads to see if so. I’m not even going to guess what the prices would be, but the group-buy or whatever for the ’18 was a damned good price. Got my kit long ago, but am still waiting for my light-only.
In general, Thorfire and Sofirn have good cells in their kits, so I wouldn’t be afraid of using those cells, and would recommend them without hesitation. Other no-name Mystery Cells can be crappy rewraps pulled from recycling bins that are 1-2 charges away from going supernova. I’d give away those cells to someone I hate.