There are enough for their environment (if you look at the link I listed above, the list is fairly long)....there just wasn't enough variety for me personally.
I like having alot of plant choices and have moved past alot of common plants. There are alot of plants that are easily obtainable on the list and pretty common, so you should be able to have atleast a little variety in the tank.
Vallisneria will outgrow the tank. Some of the others will need more than low light to thrive. But other than that, there shouldn't be many problems.