Over the years, I stayed in quite a few places near the convention center, except at the hilton. (I only pick hotels with free internet! ). Don't forget to add about 18% tax and fees for the final bottom line.
Here's where I stayed:
Hampton Inn: Very nice hotel, even includes breakfast (which you don't need!). NI Week rate was about $120 this year. I paid $100 a few years ago. Regular rates start around $180 nowadays (Hotels.com today has a 24 hours special at 104/night!). Just a block away from the convention center side entrance. (Stayed here twice).
Omni: Also very nice, but a few blocks walk up the hill. Similar NI-week rate. If you sign up for their free program you get some perks (morning beverage, free wifi, newspaper, etc.) (stayed here twice).
Hilton Garden Inn: This year I stayed at the Hilton Garden Inn, just about a block past the Hilton. Hotel is a bit run down, but OK. NI week rates this year were ~$120 including a welcome drink or similar. You should get about the same rate on the web. I did better (except no welcome drink), but the rate was non-refundable, which is a bit of a gamble. I booked a Flight+Hotel via the auto club online, so the hotel price is hidden, but subtracting the flight cost determined elsewhere, the hotel was a good deal .
I have not stayed at the Raddison, Marriott, etc.
There are a few cheaper (motel style) options, but they are a bit far to walk and probably a bit of a hassle.
You probably should wait until they post the new NI week rates. There is no sense booking a year in advance.