I've heard the 844 recommended for many things including football jigs, spinner baits, top water baits, and medium size grass jigs. I haven't heard very much about the 904 for anything except bladed jigs from @softwateronly if i'm remembering right. How do they fish compared to each other? In my mind the extra 6" would be an advantage in casting distance for football jigs and walking baits.
I'd like to throw bladed jigs as well as the other 4 things I mentioned and I'm trying to weigh out the pros and cons. I'm thinking about the IMX pro line but I might consider the GLX line if there is a big jump up in quality.