I'd go with the Wii U. You already have an XBO, and that will give you decent third party support plus XBO exclusives from the likes of Microsoft (and others). You can't go with with a PS4 or XBO + a Wii U this gen in my view.

The PS3 would be my second recommendation. You get a lot of great exclusives that stretch back many years, but I'd still suggest the Wii U over everything else since it will provide you with AAA Nintendo games in HD along with non Nintendo exclusives like Bayonetta and Sonic.

I'd go with PS3, huge lineup of exclusives and you can play any of the 3rd party games you missed on 360.

I would lean towards WiiU since you already had 360 which shares many common games with PS3. If you want the absolute best exclusives PS3 without a doubt. It has a giant laundry list of great ones.

depends on which type of exclusives you are anxious to play the most, Nintendo or sony exclusives.

Wii U. :P

Also you should add a poll

Wii U.

Ps3 you have a hole lot of exclusives to play there: Uncharted 1 , 2 ,3, The last of us, Heavy Rain, Beyond, Killzone 2 and 3, God of war 2, 3 and ascension, Metal gear solid 4... (i could be all day long)

PS3 no real debate (at least for me), its exclusives for just 2014 (at 8 years old) still beats anything the Wii U, PS4, One and 360 have.

not a constructive comment at all but...

...this is why you don't sell a console to buy another console.

Based on your comments, I will say Wii U, you are getting both the new console and also the original Wii (since backward compatibility rules!). You can play a lot of old games and the new games like 3D World, TW101, Wind Waker HD, Mario Kart and also Batman: Origins since is available on the console.