Purchase Topical Memory System Here
Life Issues Verses can be found Here
I found the Topical Memory system extremely helpful in establishing a core set of verses to memory.
Desiring God 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.