The gps modules you mention look to be very similar. Basically, the more channels, the better, and the quicker the warm and cold boot up the better. The two you mention have a 1 hertz update rate. In my mind, this may be on the verge of being a little slow for cruise control updates.
SparkFun.com has a good selection of gps's. If you wanted to go to 5 hertz updates, these two gps's can do it. I have the EB-85a, which is like the second link, but unfortunately mine does not have a battery back up. You will want one of those, but all the gps's mentioned in here, and in your links have battery back up.
http://www.sparkfun.com/commerce/pro...oducts_id=8975
http://www.sparkfun.com/commerce/pro...oducts_id=8266
The other thing to look at is the serial baud rate, to make sure they are able to adjust to what you want.
http://www.scalerobotics.com
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