what are the best apps for lg optimus zip from straight talk?

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http://androidforums.com – I just activated my new LG optimus zip from straight talk, and I was wondering which apps I can download without messing up the performance? I would like to add music to my music player, also want some antivirus /anti spyware, and something to clear my cache/cookies without having to individually check every nook n cranny on my phone for running services I need to close etc. Any suggestions? (General)