I'm the complete opposite, I have no desire for anything BUT stem plants. Here's my list:
Ludwigia repens x arcuata
Bacopa sp. Japan
That's all in a 20H. I love Staurogyne as a foreground and the ludwigias grow very well for me. There are tons of other options out there though and I'm sure others will respond with some other great stems. What's your lighting by the way? co2? Ferts? That will dictate in many ways what will do well for you.