DEFINITELY get a whether - primarily because there is a lack of uses for them. Bucks have value for breeding, does have value for breeding/milk, whethers, if they can't find good pet homes, tend to only have good value for slaughter. Getting a whether for what you need would be a good thing to do.
From a personal standpoint, I'm not a fan of Nubians. They are far and away the biggest, bossiest, and most vocal of the dairy breeds. I prefer LaManchas (my personal favorite) or the Swiss breeds (Saanens, Alpines, Toggenbergs or Oberhauslis).
Bucks are disgusting. They have such a horrible stink during breeding season due to their "buck cologne" - a very pheramone-heavy urine they spray on every surface of their pen, and on their billy beards, which they then wipe all over themselves, and on you if they get the chance. It makes a gross, oily smell in the air that you can NOT get out of your nose, even long after you've gone inside and washed. The smell even taints the taste of doe's milk - most people who have tried it and not liked it, have tried commercially raised goats milk, which is ALWAYS tainted with buck flavor due to the commercially financial decision making it necessary to keep a buck on the farm.
I never kept a buck on my farm and sent my does away to be bred, and none of my does or pet whethers EVER had any buck smell - and people could not distinguish between my goats milk and standard cows milk, other tham my goats milk was much cremier.