Upgrading power system

I have a fairly decent idea of what to put in or on my A5 as far as internals and external upgrades but when it comes to air system I have no idea what to go with.

CO2 is my current set up with a remote line

HPA I have no idea what goes with it/

From what I can understand the most optimal setup for me would be a HPA tank with a low pressure kit or a palmers stabalizer.

Can anyone clarify this for me ?
I live in socal so weather is not a factor for me neither is cost because I can shop around on ebay or anything else I just want to get some help on this stuff.

If you stick with co2 get the palmers stabilizer as they are one of the best regs for co2 (they will stop a lot of liquid getting through). But you still do get the usual disadvantages of co2 they just wont be as severe. But if you swap to HPA  you then start to gain the advantages of HPA but you will still be running at 800ish psi (i think thats what an a-5 is) and so will not be getting all the advantages. By getting a LPR kit you can get pressure down to 250psi (again i think its that but its still considerably lower) and thus the advantages start to come through of better consistancy, efficiency, etc etc. So put it down to how much you play to how much you wanna spend, just getting the stabilizer and running on co2 will be a pretty big inprovment and doesn't cost all that much, however switching to HPA and a LPR kit will give you the best gain but its a pretty big hole in your wallet afterwards. Hope this is all correct and helpful, anyone correct me if im wrong then I don't make the same mistakes again