I got mine from Akive8 recently and the service was superb, it's a great bit of kit I was amazed how much I got in it withour the pouches, but when I put them on it held everything I needed. The side pouches are the army issue ones, so I got mine grade 1 for a tenner from surplus and adventure. I thought the sack will catch up in wear soon.
If I was to criticize it'd have to be; back a little short. The tension straps seem to be sewn about an inch and a half above the end of the staves, so I may just make my own back system with alu staves laminated into a folded sleep mat. I'll let you all know if it improves it for me, when I get around to it.
I think that the OG are a little cheaper than the DPM too, but if you phone aktive8 they may be able to get the black one.