berlino, you might help people sleep, but that's it. Let it rest. I didn't read your last post, by the way, I've learnt to ignore anything beyond the second when you launch into tirades of self justification.
Anyway, OP, if you do want lights, don't bother with the shimano option, technology has marched on. The six speed is a good idea, and future proofs your Brompton usage. I'm actually with berlino, I don't think the weight saving is worth the premium for the titanium. Lose a kilo yourself, and you've improved on the Brompton and saved a lot of money