One of my favorite foamie biplanes is the Eflite Ultimate. I loved this biplane, i outfitted mine with a 6160kv brushless, CC phoenix 25, a 12x6 prop, and a TP 2cell 1320 lipo, and i was getting unlimited vertical at half throttle. This bipe was a great tail dragger. it would hover and harrier with very little input. I always set mine up at half throttle so that if you are hovering on the deck and your lipo decides to drop voltage, you still have room to pull out. biplanes also tend to fly better because of the very light wing loading compared to single wing planes.