Best higher voltage xm-l drop in?

I'm looking for xm-l drop ins for an L2X extended, and am surprised at the lack of choices. I had read up on them before buying the $15 host, but thought there must be more out there by now, especially with multiple modes. I've found:

http://www.kaidomain.com/product/details.S009944

and

http://www.kaidomain.com/product/details.S009986

Are there better options out there? Are any of them multi-mode?

I like the idea of the longer run time, and am religious about checking voltages before and after charging. I'm worried about heat dissipation with only one mode, though.

Thanks!

U2 is cheaper than T6? How come?

You prefer 1 mode only! There are various suppliers with at least 3-5 modes at the same price range.

I'd still be interested in a multi mode, higher voltage dropin. I just get the feeling that the single mode will get too hot. I might want to use it inside occasionally, too.