For a daily driver, the 2001–2003 530i with the M54 engine is the gold standard—durable, easy to work on, and perfectly balanced.
If you want the best balance of reliability, modern tech, and value, the seventh-generation is the standout choice. It replaced the aging interior of its predecessor with high-end materials and vastly improved infotainment.
While they are affordable upfront ($7,000–$18,000), they require proactive maintenance, especially regarding the cooling system. The Budget Bargain: F10 (2014–2016)