You got air at the moment? Maxflo systems are nice, remember to get the right one for your marker though, either low or high pressure.
Pesonally prefer screw in types for there simplicity, like the Nitroduck X-stream or PMI Pure energy, both really affordabel systems.
Have had an Angel Air which everyone seems to love, but personally hate it, had nothing but bother with mine
and the bloody thing kept leaking.
If your getting an air system though worth while looking at the Nitroduck, £75 they are from Pheonix.
As for bottles take a look at Just Paintball website, they are selling the new style CE bottles for around £135.
Which means you could have an air system on your marker for as little as £210
Bargain.
Dave