Im currently looking at purchasing a pre-modded PS2 system. One system is a brand new V12 PSTwo slimline with a Matrix infinity chip (laser fix installed). The other is a used model # 39001 V7 with DuoS2 Modchip. Normally I'd get the new system, but being able to add a HDD to the older system and store my backups on the drive sounds good. I've read about about the Matrix infinity chip and it looks like a good chip. Dont know anything about the DuoS2 chip though.