Stipula Sepia looks like a nice dark brown ink. Of course, I don’t like brown inks (ha!). Have you tried this one? Would love to hear about it if you have!
Noodler’s makes several highlighting inks. These work wonderfully in Preppy refillable markers and highlighters. (Perhaps in other brands, too, but this is what I’ve used.)
The color of this one is definitely bright pink and doesn’t remind me much at all of peaches. That said, I like it quite a bit.
I’ve used and reviewed Amber from Pelikan Edelstein. You can see more pictures and read the review here to see how torn I am.