Just because your goal is to have components of one brand don't mean you have to buy them all at once, matching gear can be a goal and just go about it one piece at a time.

Also, to be sure you are doing the right thing, in home auditions when possible can really help.

Whether they admit it or not most high end manufacturers have a certain sound of their own. Whether be created on purpose or just there due to topology. When components play together with the same sonic signature the result in most instance is very good.