Indeed, any universal USB charger will work, as long as it is capable of 500mA. The one you list is 0.7A (700mA) which should be just fine for charging.
Using the LG charger should be fine, the latest mobile phones feature the microUSB variant, as used on the Clip Zip and Fuze+.
The Clip+ uses miniUSB. Of course, if the charger has a standard USB socket, all you need is the Sansa’s cable to connect.
Bob 
