If you want to base it on the pictus, you should get more of its kind. They are shoalers, so maybe add five friends or more to make it happier and more outgoing/adventurous.
I would recommend 1 or 3 severums. If you are considering discus, severums are a great alternative. They might not look as pretty but beautiful enough and require less maintenance/money. We have 5 severums(2gold, 1super red, and 2green) and I must say, the male green severums are amazingly colorful, at least the one I have is. Severums are good community cichlids; ours are kept with other cichlids(3 blood parrots and 4 jewel cichlids) and 3 different schools of fish - giant danios, buenos aires tetras, and black skirt tetras. Nothing serious goes down, only some chasing and that's it.
As for going planted, you might need some better lights and good substrate.
-If you don't have the right substrate/rich enough substrate then you'll have to switch it, which would be a lot of work.
-If you don't have the right lights(they can be quite expensive)... then your plants might just die off and would make the substrate switch useless...
Plus you'll need to spend more money on fertilizer(I think the 125 will need a lot) and other plant stuff too(maybe CO2).
So picking the easiest plants would be best. You might not even have to switch the gravel or change lights if you pick the right plants. CO2 can be inexpensively made by making a DIY version. Fertilizer always helps.
There is some risk with keeping severums and plants together, I don't think they would uproot them but would probably eat them. It would be worth a try, so fast growing plants would be a good choice.
I'll try to come up with other possible tank mates for you.
As for aquascaping, have you considered driftwood? If you already have one, get some more. Making some caves with a bunch of rocks would be good too. Sometimes the simplest set ups can look the best - only if you give it some thought though.
Good example of simply nice
http://www.monsterfishkeepers.com/f...-220-South-American-and-some-of-its-occupants
also
http://www.monsterfishkeepers.com/forums/attachment.php?attachmentid=698386&d=1312335770