Staurogyne Repens any day for me, its by far my favourite stem plant. I think it will compliment your scape pretty well as the leaf shape look like it will fit in. I have it growing in my low tech betta tank for a 2nd attempt and its actually growing pretty well! Although, it can't compare to the high tech tanks, I'm pretty please with this try. I have just given a big trim to my S. Repens and am awaiting for it to send new growth which will take anywhere from 2-4 weeks for some nice results I'd say. I also second that idea that S. Repens is hard to uproot once settled!