Works for me. I've replace the main banner with the static version, and linked it again to the board. I've added the "$50" version to replace the "$25" version.
My one thought is that, during the season, we might want to leave the Contest banner up - but as you note, just have it rotate through 2-3 times and then end with text to Enter The Contest or something similar, and have it link to the Prediction thread as we're doing now. For promos to HuskerNation during the season, do what we did before - have a text strip below both banners. We can easily add and remove it - and since the promos would, I would guess, be of short duration, it would probably grab more eyeballs that way.
Then, after the season, replace the contest banner with a static HuskerNation, linked to HuskerNation.com. We could either then use the text strip below it for promos, or create custom banners that include the current promo.