What is the lightest, bump feed, trimmer that you can buy?

I too have a FL20 weedeater. I like it because it is light and has the bump feed, but I am tired of trying to get it to run properly. I have had it for several years, but it has been a long time since I could run it wide open and I always have to run it on half choke to get it to run at all. I am ready to buy me a new one, but I want the lightest one that you can buy and it must have the bump feed. I am old and have arthritis is my elbow, so it must be light and dependable. Has anyone got any suggestions on which weedeater that I should purchase?