replacing iBlue747

I use an IBlue 747 for several years now. The only things that could be improved are the accu and memory capacity. The device is getting a bit buggy now. What new device shall I buy?

Why do you not buy the

Why do you not buy the updated version from the 747A+ the 747proS http://www.gps-gipfel.de/GPS-Logger/Transystem-i-Blue-747ProS-GPS-Datenl...

Regards