What DSLR do you recommend?

I own a Sony a100 and a Canon Rebel Xsi. I know these camaras are not considered professional dslr's, but I'm saving up for on right now. I already photographed two weddings with each camera and people really liked them, so I imagine if I had a better quality camera I can deliver better shots, and take more wedding photos. I have purchased a lot of equipment for each but I really need to step it up. What camera do you recommend I upgrade to? It doesn't have to be Sony or Canon. I just want something better with for better quality photos, within a reasonable price. Thank you.