River Rat,
The Aleph series with the 1x123 packs are by far the nicest readily available 1x123 lights, but since you're a new CPF member and your friend is possibly not even a member at all, you or he might be shocked at the idea of paying $200 for a flashlight. All I can say is that flashaholism is a less expensive hobby than exotic sports cars. If you spring the cash for it, you'll have a light that can't be beat, but I can perfectly well understand if you decide that you're not up for something that expensive. (On the other hand, you could hang around for the next time a tvodrd light comes up for auction. Those have been going in the $500 range).
I don't think the FFII is really appropriate. Its main goal is to be a high performance light that is as tiny as possible. But I think your friend will be fine with a normal sized light.
Most of these high performance Luxeon lights will be 10x-15x brighter than the Infinity Ultra, which itself is about 2x brighter than the somewhat less common regular Infinity (I wonder which of those he really owns). That is, they will be in the 30 lumen range where the Ultra is maybe 3 lumens and the original Infinity is about 1.5 lumens.
If all your friend wants is "significantly brighter" but not necessarily high performance, he might consider the Tekna Splashlite LS which is maybe 8-10 lumens, with proportionately more battery runtime than the brighter lights will have. It's made of plastic so it's very lightweight and waterproof (about 1.3 oz with battery, compared to about 2 oz for the Infinity/Ultra), and is $40 retail, possibly less from some of the CPF discount sellers if they carry it. Disclosure of interest: maybe I'm plugging this light partly because the manufacturer sent me a free one for testing, but I do like it a lot.
Also, incandescent is ok if you're prepared for bulbs burning out at inconvenient times. That's why spares were invented, and normally carrying a spare is enough to deal with the burnout problem. LED lights are pretty new, so until recently, incandescent was all there was, and we survived. The E1e is nice, and you can always add a KL1 head later.
Finally, the venerable UK 2L (incandescent) uses 2x123 but is still lighter with batteries than an E1e because of its plastic body. It's bright, waterproof, and very tough. It was my main outdoor light for a long long time. There's an LED lamp for it which is less bright (maybe 10-12 lumens) but will run for around 8 hours on a pair of cells. The high performance 1x123 lights will run for around 1 hour on a cell.