The Howa is a great rifle and you would likely have to spend twice as much to do better. And by the way, the weatherby vanguard is a re-badged howa, not the other way around, and howa does not make "weatherby". Howa makes the vanguard. The mark V is made in the U.S. The weatherby pump and auto shotguns are made in turkey (although until 2007, their autoloading shotguns were made in Italy). The discontinued weatherby over and unders were made by SKB, which no longer exists. So weatherby's have mixed parentages.
As for the 6.5x55 versus the 6.5 creedmoor: I think for both cartridges availability of brass may be a consideration, although the 6.5x55 has been around since 1894. This may not matter to you but the actions lengths wil be different. The 6.5x55 has a long action, while the 6.5 creedmor has a short action.
Plus, what will be it's use? If it will be a range toy or target rifle, then I would choose the creedmoor. If the use will primarily be hunting, then I would choose the 6.5x55, which can be hand loaded in modern rifles to give better performance.