My daughter has been wanting a road bike for awhile. She is only 4'8" and is about 75 pounds. We have looked at the 2005 Trek kids road bike but it fits her about right now so it wouldn't last too long. I think that a 43"-45" women's bike would be a better fit and would allow for some growing room. A very important factor for her is the weight of the bike. For her size, anything over 20 pounds is a real grind. I am hoping to pick up something in the $500 and under range. Haven't had much luck on E-bay with bikes this small. Any recommendations?