If you're bored flying the 540T, go for either of the Bipes (with some assistance as Bruce recommends. If the 540T still gives you an adrenaline rush every take off and landing, stick to the SSE.

The planes you have are pretty forgiving. Flying the Bipes you'll need to learn to fly the plane in for landing, rather than chop and drop. Also, don't force the Bipes off the runway. They have a much higher drag than the normal monoplane, and it easy to induce a stall on take off. Get the wheels off the ground and let it build up more airspeed. You'll also find the Bipes to be much shorter coupled between the Tail and the Main wing. You'll be much more likely to ground loop on take off if you try to add the throtte too quckly.

Whatever you purchase, good luck and have fun.

Brad