I'd like to do one when I get the money, but mine will likely be large Amazonian fish as I already have several of them and my knife should turn out to be quite monster.
I've wanted to do a 6'+ planted angel tank ever since they set a huge one (probably 12+' long) at the Columbus Zoo Aquarium and I used to have some pics of it, but I lost the files and now they tore down the building it was in...
It had probably 15 pairs of angels, hundreds of cardinals with some bloodfins and rummynose thrown in. Probably a dozen pleco species and tons of otos. A massive group of Cory. sterbai and probably a few other random fish here and there.