I agree with michael here, if you enjoy Skyrim and want to deepen your experience get the Legendary edition. You will be glad you did.
The DLCs are highly recommended.
Dragonborn and Dawnguard both add a lot of content.
Xbox Live is free. You just need to set up an account with an email address, then plug the internet into your Xbox.
After downloading, you can unplug and play as normal.
This way you can also get the free patches for Skyrim.
If you don't have internet at home, then I'd go for the Legendary edition.
You might want to wait a little longer with getting the Legendary Edition and spring for the http://www.bethblog.com/2013/08/07/the-complete-elder-scrolls-collection-comes-to-pc-this-september/ instead.
That's PC only, did OP mention which platform he's using?
Still, everyone should buy the Anthology for the maps. I know I am.