RE: First Low-wing Tail dragger
The WM Rambler 45 is a great first low wing tail dragger, its a slightly big plane for a 40 size, handles superbly on the ground and in the air, all you need is any 46 2C and she is happy.
Like what Forestroke recommended, the WM Super Chipmunk is one of the best planes you can buy and fly for its class and price. Totally stable and will be very happy with a 90 sized 4C. She will come in for landing slightly hot if you do not flare her. The build is immaculate and flying it is a dream. She has almost no KE coupling. This is one of my favourite aerobatic scale plane. Old school but totally fun to fly ... my No. 2 is coming at the end of this month and it will have my YS110 in her.
Don't be scared of any tail dragger, its the same as a trike ... just watch the plane and do whatever it takes to keep the nose straight, it only means a little right rudder. Even on landings its the same as a trike. There seems to be more worry about flying a TD than it really is.