Being half-facetious... Jadis makes (or made) everything you need (except turntables). And the current North American distributor makes cables to boot...
I have heard good one-make systems from McIntosh (except CDP), Linn, Meridian, MBL, and recently Jadis and have had the experience range from being pleasantly surprised to being highly envious by all of them. There is absolutely nothing wrong with the question. One thing to note: if buying used, one is much more highly dependent on the after-market service policy offered to a second owner. Some makers are not second-owner friendly, some are. With one brand only, there is much more of a risk in getting that part wrong.
I have heard good one-make systems from McIntosh (except CDP), Linn, Meridian, MBL, and recently Jadis and have had the experience range from being pleasantly surprised to being highly envious by all of them. There is absolutely nothing wrong with the question. One thing to note: if buying used, one is much more highly dependent on the after-market service policy offered to a second owner. Some makers are not second-owner friendly, some are. With one brand only, there is much more of a risk in getting that part wrong.