What are the largest budget conference hotels in Changsha?

There are many economical ones, and I know these two big ones:

Furong Economic Development Zone has a Linzi Convention and Exhibition Hotel and a Tian Xiang Convention and Exhibition Hotel, next to the Academy of Agricultural Sciences.

There are many superior conference hotels to choose from (to name a few):

St Philip, Sheraton Wanda and Century Golden Resources Hotel in Kaifu District.

There are Rongcheng Garden Hotel and Wuhua Hotel in Yuhua District.

There are Puri Hot Spring Hotel and Jiaxing Shizun Hotel in Wangcheng District of Yuelu.