Buy or skip?

I love this fanny pack/bum bag like they call it in England! I don't know if I should and which color? The blue, navy or cream. I love the vibrant blue, turquoise color but I think the navy matches pretty much everything. The cream is a bad color for me because it can get dirty quite easy. Its about $800 from Decades in LA. What should I do? Which color? And are fanny packs coming back? Who cares, right? As long as I like it.... HELP!