plants for new tank

I am just about ready to set up a new 50G tank 36" x 18" x 18".  It will have 
120 watts of flourescent light, duplarit, Co2 injection an moderate fish load
(eventually) I know I need to set it up with fast growing plants which I can 
swap for slower growers when things settle out.  I'm interested in people's
suggestions for fast growers. I'm going to keep ph at neutral. Carbonate 
hardness is around 7 dkh general hardness is 4 dkh or so.
				Thanks in advance,

					Miles Morrissey  mmmorris at smith_edu
					Easthampton, MA