I have been riding an extremely heavy, rusted, Walmart bike for the past two years. It is my only form of transportation. I'm 5 foot 4 and weigh less than 100 lbs, and after experiencing what a better bike feels like, I've decided it's time to get something new. I ride a decent distance daily (about 20 miles) on paths that are mostly paved but not always. I occaisionally take longer rides. I am looking into getting some kind of reasonably priced hybrid that is light enough for me to lift, and reliable enough for me to take on longer trips. Any suggestions on where to look? I would prefer to buy used.