Why not a philodendron? They have both volume and structure! They are the ones also known as "swiss cheese plants" and have slits in their leaves to let in light to all the neighbouring leaves (when they grow in the jungle!) I was assured at Migros florist dept. that they were coming back into fashion! I didn't realise they had gone out of fashion actually; I've had one for years and my daughter has grown cuttings from it. It's always an event when a new leaf unfolds. I think Migros plants are pretty good quality. I once bought 2 identical plants from Ikea, only to find that one of them must have had a disease of some kind; every time anyone walked past it a leaf or three would fall off until it was quite bald! Its twin still survives. I think re-potting after purchase is a good idea. Have fun.