that zeppelin u mentioned is obsolete now
seriously i can recommend a 12 litre 300 bar tank. get one from midland diving or its retailers it comes with an airgun type valve and gauge and filler hose.
looks like this.
http://www.airgunbuyer.com/Showprodu...ng%20Equipment.
or
http://www.midlanddiving.com/
follow the pic links to the gun section