there is a couple mods at pbn that people have been doing to there the ones like qev's and new lpr's just do a search on PBNATION.COM and u will find all u need to know
The Torpedo Reg looks really nice on The One. It's good for both co2 and HPA. The CP reg is really good for HPA but its not the greatest with co2. Both have pretty good recharge rates so they definently will be able to keep up with The One.