Fast growing stem plants for alkaline water?

I am looking for some fast growing stem plants that grow well in alkaline water. My tap water is about 8.5 and I add ph down to water during water change and get it around 7.5. Preferably something I could get fairly easy online like aquariumplants.com or somewhere else.

I have some Limnophila aromatica wich does alright but not great.
Also have Telanthera rosefolia and it seams to be doing good.
I just need some more I have alot of background space to fill.

http://www.aquariumplants.com/Limnophila_hippuroides_Limnophila_aromatica_hip_p/bp71.htm