Ludwigia 'Cuba' will easily grow 24"++ without losing lower leaves. A good specimen will reach 4-5" in diameter just for the main stems.
Limnophila hippuroides tends to lose bottom leaves as it grows up. It also tends to grow left and right and any which way except straight up.
In one tank I use Limno as the background plant (it's cheap, and to me, has a 'softer' look) with 3-5 Cuba as accent plants in the middle. If you have decent light+co2 count on trimming Cuba every couple of weeks.
Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD