Navigators – Early in my Christian life I found the Navigators Topical Memory system very helpful for building a solid foundation of Scripture verses to commit to memory.

Topical Memory System 

Fighter Verses:

Bethlehem Baptist Church where John Piper is pastor encourages their people to memorize scripture faithfully. You can find the Fighter Verses Here

Recommended listed of extended passages for memorization Here
Desiring God provides Fighter Verse apps for both Iphone and android phones.
This website provides their list of 100 favorite verses for memorization here.