If you want a black suit, get one. Much of it comes down to how many suits you own (or can afford). If, for example, you have 15 - 20 suits, and none of them are black, you may wish to reconsider. If, though, you have 5-ish suits, and none in black, that may be perfectly reasonable.
I have plenty of suits, and 3 of them happen to be black (solid/single breasted/3 button; pinstripe/single-breasted/3 button; solid/double breasted). I regret the purchase of none of them.