All the games you've listed are good choices. Mario Kart 8, DK: Tropical Freeze, and Wonderful 101 are also must-haves.

Chose:

Retail:
-Nintendo Land
-Zombi U
-New Super Mario Bros. U
-Monster Hunter Ultimate 3
-Lego City Undercover
-Wonderfall 101
-Pikmin 3
-Zelda Wind Waker HD
-Mario 3D Word
-Donkey Kong Tropical Freze
-Mario Kart 8
-Hurley Warriors
-Bayonetta 2
-Super Smash Smash Brawl
-Toad's Treasure Tracker
-Kirby

Later:
-Splatoon
-Yoshi Wolly World
-Mario Maker
-Xenoblade X
-Star Fox
-Zeda U

I plan to get a Wii U next month as well. This is what I will buy in the next few months. The bolded are must haves for me:

- Pikmin 3

- Super Smash Bros U 

- MK 8 

- Wonderful 101

- 3D World

- Windwaker HD

- Zombii U

- MH3U

- Kirby and The Rainbow Curse

- Donkey Kong Country: Tropical Freeze

- Captain Toad

- Bayonetta 2

- Hyrule Warriors

That should last me until Xenoblade X and Zelda U release, although I have plenty of 3DS and PC games to play as well. 

Zombie u and Mario Kart. You will never get Zombie u again and for me it will end up worth more than you pay for it

I absolutely adored Pikmin 3! So I would say it is a must. Mario Kart 8 is great. 3D World is another strong contender. If you like Bayonetta and Platinum Games maybe you should check out the Wonderful 101, that game deserves more love.

The Pro controller, i cant remember the last time i had to charge it, Awsome battery life

External memory if you get the cheap one

If you get Mario Galaxy 2 or Metroid trilogy make sure you have a Wii mote & nunchuk

Try to buy and eat organic food

Moderated - Leadified

I'm glad you're finally taking the plunge dear. I look forward to playing online!