Tablet for power points in class and once in awhile productivity?

[Adam S]

Talk about first world problems but I've been really struggling with what tablet I should choose. I'd like to use a tablet in class for reviewing lecture slides as the professor goes along as well as creating simple spreadsheets (although the more functionality the better) for when I'm in research. The ability to present a power point would also be great. (http://www.youtube.com/watch?v=3FFa5YGPVIs)

The options (in my mind):
1. Nexus 10
2. Microsoft Surface
3. IPad 4

Nexus 10 likes:
High res display
best internal hardware
100 dollars cheaper when purchased from google play
can probably get away with doing all the tasks of the other two..and is 100 dollars cheaper.

dislikes:
Not a champ for productivity
poorer battery life than almost any competitor.

M Surface:
Nice hardware
10.6" screen (I feel like bigger the better for productivity and I really like the added size) but still about as light as the others.
Lots of additional functionality like a file system, Microsoft office RT, USB support
would be nice to support Microsoft for once.

Dislikes:
outdated hardware (Tegra 3 processor)
probably would need the expensive cover/keyboard which I'm not sure I'd like to type on.



Ipad Likes:
Obvious benefits of greatest app selection, new great hardware, Airplay for apple tv.
Resale value.

Dislikes:
I really don't like being locked into Macs selection of apps. I feel like they are trying to limit my world and the content I view. They don't allow developers to use any SDK other than theirs for new web browsers and I just don't trust them.
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So if you had to buy one of these tablets with your own money, for productivity purposes, which would you buy?