size matters

Hello all. New to the forum but a longtime lurker. I hope someone could give me some advice. I have a canon 50d and need to upgrade to something better. Money is not an issue and the reason why I need to upgrade is because i want to start printing in very large format - up to 200cm x 200cm - and I would like it to be perfect. What I am aiming for is museum quality prints. I have seen some, even bigger than 200cm and the image was perfect. What camera would you recommend for that? sorry if its a repost but could not find any similar ones

Thanks in advance