You have to love Black Friday! Sometimes you can get the best sales. Glad your excited about your new tank. Large tanks can be lots of fun and vary rewarding. Good luck with your build and Ill stay tuned, it sounds like you have the right idea with the substrate and low maintenance plants. Now for a nice group of discus and you will be all set. I would suggest looking into the Fluval Fx6 for that thank I think it would make a nice main filter for that thank size and you can add a lot of media and foam also clears up the back of the tank. And I would get at minimum 2 good 300w heaters and a back up in case one goes down, makes heating large tanks easier and more stable. And get your self a good water change system (draining & filling) this can make or break large tank ownership 5g buckets don't cut it it kills your back. Also advised you store and heat your water when doing large water changes. Any questions just ask.