Longman Advanced Chinese Dictionary - $19.99
Traditional-character-only Chinese-Chinese dictionary from Hong Kong with 46,000 entries; not explicitly for Cantonese, but with good coverage of a lot of vocabulary you don't often see in mainland dictionaries.
Xiandai Hanyu Guifan Cidian - $29.99
Chinese-Chinese dictionary with 71,000 entries, featuring detailed / explanation-rich definitions; recommended only for advanced students.
Xiandai Hanyu Dacidian - $19.99
Chinese-Chinese dictionary with 110k entries
Hanyu Da Cidian - $49.99
The legendary historical Chinese-Chinese dictionary, with approximately 380,000 entries and extensive citations. NOTE: definitions are in simplified characters only and most quotations are in traditional.
Duogongneng Chengyu Cidian - $19.99
Chinese-Chinese dictionary with detailed information on about 8000 Chengyu. This is a "multifunction"dictionary, so along with definitions it includes synonyms, antonyms, historical quotes, usage notes, comparisons with similar Chengyu, etc.