if its definitly the rim you need to change, dont't waste money and change the hubs? my advice is use photoshop and see what looks good. If you decided that no matter what rim colour you get, the hub looks naff regardless THEN buy a complete wheelbuild If it were me, id replace the spokes too as when i first started wheelbuilding I was told never to re-use spokes. But if they're not that old, and they're the right size theres no trouble using them again. Just remember you can get coloured spokes + coloures nipples too