It really looks like you've worked hard on this.
I think some anubias would look nice. Maybe one of the new hybrids like starburst or wavy leaf would be interesting
I wasn't sure about the crypt, it did look like it might be emersed growth.
I know those swords can get unruly. I am trying out some Red Melon/E. barthi now, and that might work well in your tank (gets to about 10"). It has reddish oval leaves. Is this the 75g tank?