I'm guessing you might want to go with a Pascal board and be done with it - P1-X4 board - . Do you know if the MPU works yet? These System 1's are famous for the spider chip issue. There's a lot of steps in the Clay guide during testing of the MPU board where you have no choice but to buy an Ni-Wumpf / Pascal board.
210 euros for the P1-X4 board (all 4 boards in 1 - mpu, power, driver, sound), or the P1-board (130 euros).
http://www.flippp.fr/en/Ordering is bit time consuming and via email communication. Once paid for, deliver was quick.