Fuggles and Goldings would be a more traditional choice. I'm trying to imagine a big sweet malty old ale with hops and I waffle between the earthy, spicy, herbal combo I get with the Goldings/Fuggles (shh denny, to each their own) combo and the brighter citrus/pine thing if you used centennial and/or cascade.
It's already brewed, so the Centennial is foregone.
I'm a fan of Fuggles/Goldings even if some think they taste like dirt. Just not sure that dirt will mix well with the Centennial.
My most recent beer is dry hopped with cascade and willamette and it smells fantastic. I think earthy and citrusy work well together.
Agreed, especially in English styles and as long as you're not talking massive West-Coast IPA amounts. I use Caliente in English styles quite a bit. It has some citrus, but it's mostly stonefruit with some earthy Fuggles notes in the background. It combos great with Centennial, and I've used it in ESB's with EKG/Willamette as well.