Funny you should post this
I'm just about ready to move our six dollars into their new planted 65g tank.
Will they eat the plants? Well, from what I've read it's an individual thing: some specie will eat certain ones and some won't, some younger ones of a specie will and the older ones won't and vice versa.
I've got three
argenteus (spots) and three
hypsauchen (no spots). Two of the
hypsauchen and one of the
argenteus are young, about 2", and the others are older, ~4". Right now they are in my 36g, which was holding all of the plants that I put in their 65g, as well as the plants I have leftover from another move.
I've seen what they nibble on and what they don't

The younger dollars try every plant, at least one bite! They have eaten ALL of my bacopa, and I mean ALL of it. The roots are still in the ground, but everything else is missing

Most of my amazon has been razed, my radican sword has been nibbled around the edges, but ONLY the green leafs, they don't like the red marbly ones. Anacharis is almost gone (yay!) and they like the water sprite, but I put those in there for them to eat.
They tried to nibble my melon swords and the onions, but didn't like them very much and left them alone. They did not touch the anubias at all or the Kleiner Bar or rangerii swords. Maybe they just didn't see the two swords.
What I've got in the 65g: crinum ("onion plants" -- dwarf, regular and the twisty one), Zephyranthes candida (dwarf onion), anubias, java fern, Rangerii sword, Kleiner bar sword, melon sword - red.
I'm going to float water sprite tied with fishing line to shade some areas, but since a couple of those plants are moderate light plants, I can't shade them. I'm also going to dither the lighting with cardboard in the places where light doesn't matter so much.
Hope that helps, and if you aren't ready to do it yet I can update in a couple of weeks and let you know how it fares and which plants don't get eaten.
Roan