I scraped the decals a little to add a realistic effect.
Here's the base I will use. I am going to hit the dirt parts with the airbrush, and add whatever color that winds up being to the Vallejo sticky textures and pigmentation mix I use around the feet and on the ground.
I even managed to get Dante primed and put down the basest of base colors: mahogany!
Here's my question: How much weathering do you want to see on the dreadnought? I can't imagine that the Ultramarines would let their Dreads get really messy and torn to pieces, unless it was part of some long campaign. That being said, I don't really like the fresh-off-the-lot look, either. If you have suggestions, put them in the comments. I don't get too many readers here, so I'll basically do whatever is suggested (low-medium-intense choice of weathering).