I use the Holman Christian Standard Bible and it is wonderful. Alot prefer the KJV because the poetic style of English seems easier to remember. What I teach others the keys to memorizing scripture are: 1) Ask the One who inspired the scriptures, the Holy Spirit (2 Peter 1:21) to help you. 2) if you have a hard time remembering words, try to remember key words from the verse, those will help fill in the rest of scripture. I think the important thing about "hiding God's word in your heart" is this, not to pressure yourself into knowing every single verb, adverb, etc about the scriptures, BECAUSE EACH TRANSLATION WILL INTERPRET THE ORIGINAL DIFFERENTLY, so if you memorize in KJV, the word will be different in the NIV, ESV, etc. I think as long as you understand the thought of God, the attitude, the purpose you'll be ok.