The Marantz PMD620 does record 4GB files, like you said, but it also has the feature you list for the 671 (start new file after specified time). Increments are 1, 5, 10, 15, and 30 minutes and 1, 2, 6, 8, 12, and 24 hours. The 2 hour is close to 2GB for 24 bit files (2:08 for 44.1 kHz and 1:52 at 48 kHz).