GPS Data Logger Software - BT747

I currently use a Holux M241, and the features I like most are

• AA battery: you can get them anywhere on this world
• Display showing coordinates or velocity or distance
• Good cooperation with BT747

However, the memory for 131000 track points (less with newer firmware) is a bit tiny for any holiday of more than a week.

I found the "Locosys GPS Walker" with about 2 GBytes of Memory (and a built-in mp3-player, who needs that?), but that thing has some disadvantages:

• no display of coordinates
• If velocity is shown, the backlight is always on (although also the direction to a previously stored point is shown, which is a nice homing-feature)
• cooperation with BT747 is rather tricky. Somehow I managed to get the html output anyway.
• it is a bit unreliable, sometimes it turns itself, or only GPS logging, just off.

Anyone knows a M241 with ten times its memory?