Sandisk part numbers are decoded like this product-capacity-packaging when ordering no real need to worry about the last part. this only dictates the languages on the packaging.
the compatibility tool on the sandisk website shows what will work best with your host and not be overkill. Basically the standard cards are recommended as the phone you have will not take advantage of the cards with a faster speed. the other compatible cards are basically any other micro SD as they will work with the phone but you will not see the full speed of the card when used in that phone because the phone simply does not support the faster speed. standard cards are typically class 4 even though it is not listed in the picture.
Sandisk uses a tired product map. The black cards are the standard cards. these are the cheapest and slowest cards. the next levels go like this
standard
Ultra
Ultra+
Extreme
Extreme+
Extreme Pro
High Endurance (for survalance video recorders)
All the info on the differences of the cards can be found on the sandisk website.
http://www.sandisk.com/products/memory-cards/microsd/
hope it helps
