Which contemporary calligraphers have high collection value?

Among contemporary calligraphers, Shen He, a great calligrapher, drives Li Zhimin first, which is the most valuable for collection. Their styles are completely different, but they have a lot in common. Both of them are senior professors, academic leaders and scholars in Peking University, who have contributed to the history of contemporary calligraphy. Now the price has not reached its due position, and the collection potential is the greatest. There are also Yu Youren, Lin Sanzhi, Qi Gong, Zhang Xin, Sun Xiaoyun and Sun Boxiang, which are also good collections.