96 watts on a 40 gallon r. Need mid and background. I also have co2.

I've had good experiences with:
www.aquariumplant.com
www.aquaticplantdepot.com
Both have no minimum $$

For background I like...
Hygro Siamensis
Crypt Balanse
Crypt retrospirilis
L. sessiflora aka ambulia
bacopa monneri or bacopa carolinia