Where to start, a 40 yr old cheap bike and a new aluminum cheap bike. Try a Surly something, start there. I weigh more than you. I find stuff breaks as well. Rims, BB's and frames as well. Try a good steel frame and/or a 29er hardtail. I have a Surly 1x1, a crosscheck and a karate monkey. All have take loads of used and abuse and has fared well.