Hi, and welcome!
Vals (valisneria species) are supposed to be easy to grow, and will get quite tall/long (when they reach the surface they curve over and trail along just underwater. They'll root into sand VERY well and spread roots through your tank. Amazon swords also root well, although they may need supplemental fertilizer tabs; they get very big also so might outgrow your tank.
Cryptocoryne species root nicely, although don't necessarily get so tall - probably about 1/2 to 2/3 the height of your 10g, although they'll get taller under lower lighting.