Best GPS unit for track logging?

I currently use a Magellan 330, primarily for recording tracks (hiking
and driving) that I later transfer to maps and/or produce elevation
profiles. I'm looking to replace the unit with one that will:
* offer better battery life
* allow an external antenna
* record more than 2,000 track points
* record horizontal position, altitude and time (as my Magellan 330
does)

I've read good reviews on the Garmin 60C and 76C units, but not many
words on track logging. I have some questions:
* what is the minimum distance between track points that can be
specified?
* is altitude recorded in the track log?
* I read that "saved" track logs lose their timestamps.... true?
* can the track logs be saved to the SD card (on the "x" units)?

--
Dave Herzstein
dave@xxxxxxxxxxx
http://pixseal.com

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