After doing a fair bit of reading I came up with the following results:
Globalsat DG-100
Chipset: SiRF StarIII
cheapest found was $112 from http://www.expansys.com.au/d.aspx?i=149006
Pros
* per second logging
* 60,000 point memory
Cons
* doesn't record dulution of position
* fragile housing
* non-standard data access via windows only software, gpsbabel claims to be
able to access
Amod AGL3080 GPS Data Logger
Chipset: SiRF III
Pros
* per second logging
* can store dilution of position information and almost all GPS data
* 256,000 point memory
* shows as mass storage device, text based nmea log files
Cons
* Can't find .au distributor
All MTK chipset devices seem to be unsuitable for OSM purposes due to minimum 5
second logging, at 100km/hr there will be almost 140m between points.
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