Seiko does a good job with band selection. With that said my new Seiko 5 strap has made me realize what a huge difference there is in quality between my Equus strap and the stock Seiko straps, even on their higher end lines.
I love that combo. I have the SARX019 (midnight glazed croc), SARB Cocktail Time and SARX029 (black croc). Also a Seamaster on a dark brown croc grain. So though it would be a good idea to bring some tan into the mix as well as the blue on the Seiko 5. The enameled dial is beautiful, can't figure out why it is always so hard to photograph.