The Time Ranger has gone through numerous revisions. The early ones were dual 9-volt. They went to a dual-C setup around 2003 for a few years, then went back to a dual-9 and made other changes.
Between my early 2001 version and your dual-C, it may be close to a toss-up, but there are apparently some minor differences. I guess the newest one has a new motion all-metal mode that some say is pretty hot.
I sure enjoy mine. It's easy to get well-acquanited with so it becomes second-nature to operate. Everything's always there on the main screen, no menus to page through.
Check out my page on it: http://www.whiteriverprep.com/vintage/timeranger/timeranger.html
Do a search here on Findmall for the Time Ranger. This topic has come up and I and others have replied with some more in-depth info.
Here's a couple old threads about it:
http://www.findmall.com/read.php?60,902522,903265#msg-903265
http://www.findmall.com/read.php?60,898787,899264#msg-899264
http://www.findmall.com/read.php?60,750845,page=1
-Ed