What is the best phone available on the Sprint Network?

I'm looking for a phone on the Sprint Network that has the following capabilities:

1. Good for texting, preferably with full keyboard.

2.Good for music. Has an MP3 player that you can load music from your computer onto an SD card, and can create playlists.

3. GPS Enabled

4. Touch-screen is ok, but not necessary.

5. Small and lightweight, but durable because I drop my phones a lot.

I'm not changing my network to anything else, so only list Sprint Network Phones.

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