I would buy a daedric weapon or glass weapon. I'd definately buy a glass bow especially if it actually worked, or a daedric bow for that matter. Perhaps a dragon skull to go along with my alduin statue.

Ancient Nord Armor.

I could look like a bad-ass, and then give it to one of my lady friends and make them extremely attractive.

I'd buy a working Spell Tome.

Definitely weapons, a statue of a soldier with an arrow in the knee, a backwards flying dragon and more

A mini dragon skeleton on my table, which adds another one each time I kill it.

Aside from a Daedric Greatsword, which I would want since its my main weapon, I'd want replicas of the Chillrend, [insert unique weapon here], etc. etc.

Unlimited quantities of invisibility potion.