Try linking up the following villages it will take you via some great mid-wales roads that you may well already be aware of.
Going North to South at Mallwyd turn left on to A458 for a mile or so then turn right down a tight B road (just on a bend) possibly marked "Pandy" that leads on to Llanbrymair.
At Llanbrynmair turn left for 20 yds on A470 then turn immedeate right on to B4518 toward Staylittle and eventually on to Rhyader.
the Ponderosa was great,the food there is really good,the Dee Valley down to Llangollen is beautiful,broad leaf trees everywhere
PW, I did plot the route you gave me into the sat nav but I got tyred by the time it came to ride it and headed for home so it will be done another day
Just when you think you have seen it all new places are found