Sigil stone. Would make more a good bowling ball.

Amulet of Talos (I could always buy a necklace with Tor's hammer, but that's not the same thing)
Amulet of Kynareth (it's pretty)
Sanguine Rose (if it works!)
An unusual gem (shiny!)
And... can I have Paarthurnax?

you can already have that, although doesn′t work

i would like everything, but mostly every book!

Do spell books work like the work in game?

Hjerim

Ebony greatsword.

Breezehome.

Gotta say I'd either want the Oghma Infinium or Arvak as someone else mentioned. Being able to summon and desummon my own horse would be great, once I got used to riding it I could save loads of money and not have to worry about loosing my drivers license, of course as someone said suddenly having the ability to summon something or preform magic in any way might get me burned at the stake, and barring that locked up in some lab to be examined so that the government could do it too. So I'd probably end up going with the book too, then I could learn all sorts of stuff and have lots of fun.

Sanguine Rose - if it really worked.

Eye of Magnus - in my basemant or garage

My very own armored Troll - I will call him George

Eye of the Falmer - Id sell it and have Spongebob type money like when he and Patrick sold that giant pearl.

Few bottles of red water skooma

Lakeview Manor, Wabbajack, Gold bars.

Curved swords