I went ahead and soldered all of the parts on the board. During assembly, I discovered a design flaw that reverse the I2C Pins over the voltage converter. So, SDA 5v translated to SCL 3.3v and SCL 5v translated to SDA 3.3v. Ok, no big deal, I'll just reverse wire any external I2C devices. Then I remembered that my gyro/accelerometer/compass was wired to the I2C 3.3v side, so I cut the traces with an exacto knife and used my circuit writer pen to draw new ones. I'm still doing testing at the moment. The SD Card Reader worked awesome, but I'm running I2C Scanner and it just keeps getting stuck on "scanning...". If I unplug my board from the arduino, it runs fine. I found 2 traces not working while testing and fixed those. I may end up wiring my external logic converter and the compass to a breadboard and see if I get different results. If so, at least I have something to compare it to.