To be honest, I'm really not so much of an expert... I just know I like the plants I have. I really like melon swords, anacharis (grows like a week), moneywort, ludwigia, four-leaf clover, Val spiralis, sagittaria subulata... you could probably do a lot of those... I think the API tabs are good, but I don't know much about seachem. =]
From looking at your tank though, it looks like you might need more gravel.