I really like the loomis brand (own a gl3) and the fact that they use full cork on their MBR and Mossyback series. So with that said, I am pulling the trigger today on a mbr843c imx today for senkos and t-rigged plastics. I am also going to pickup one of these two: Another mbr843 imx, or a bcr804c. This rod will be my primary jig rod for pitching mainly. If you had to choose, which would you choose and why?

The IMX series are great rods, if it were me I would pick up an 844 for jig fishing instead of two 843.

No reason to get two MBR843's. If I were you I would skip out on the 804c and get a MBR844 to complimennt the 843. Both are very versatile rods and can handle bottom contact applications and are good spinnerbait rods a s well. Use the 843 for the lighter stuff and the 844 for the heavier stuff, pretty simple. 

Go with 4 power rod as it will handle your heavier jigs and T-rigs.