Here's another with Wii U style shoulder buttons and face buttons closer together. The original was exactly the way Vita has it, probably because at the smaller size they wanted them a bit further apart than appears visually correct.
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I like this the best. Add gyro, 360 triggers and make the trackpad clickable on all 4 sides for 4 extra buttons (2 can be start and select) similar to the old iPod touch wheel.