At one time I would have yelled at you to download Angry Birds immediately, but sadly that game lost my interest long ago.
If I had your phone I would recommend trying any of the HD games by Game Loft! I have played many and enjoyed them all, but my A855 can't handle all the games your phone can.
Non game apps can vary so greatly from person to person based on interests. With that said..
Anyone can make use of Vlingo! It is a voice activated application that accomplishes everything the stock Google search(with voice) already does and a lot more. But specially I enjoy the Car mode replacement and SMS to Speech(TTS) as well as the many advanced options.
File Manager .. so many new great ones to choose from, but only one needed lol. Root Explorer is the best for what I need. File Expert is second best in my opinion, in front of Astro which are both feature rich.
Use in combination with a wireless file transfer app.
Dropbox, Awesome Drop, WiFi Explorer Pro, or just use the built in networking feature of File Expert if you share folders on your home network.
That should get you in control of your file system and keep you away from USB transfer cables.
In case you didn't know, that USB slot will be reserved for constantly recharging your phone if you are new to Android until you have downloaded the entire internet at 4G speeds. (I kid... but yeah keep a charger handy)
SwiftKeyed ' from my Moto A855 using Tapatalk. ;].
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Yeah I said SwiftKey... temporarily bored of Swype.