I'm with what Bob said.
1020 steel is cheap and heavy, 4130 is a little step up, but Columbus or Reynolds tubing are probably the most desirable.
1020 may be cheap. But it can still be made into a good bike. My daily commuter is a butted 1020 Le Tour.
I see that the cable guides are under the top tube, like on my Le Tours.
http://i77.photobucket.com/albums/j7.../yelletour.jpg