Air pump size??

[warped1]

While I am at my lfs getting the equipment that you all helped me decide to get for my tank (much thanks again) I wish to buy an air pump and a bubble wall (the bubble wall is the only thing the air pump will be used for) I have decided on a Whisper, they are quiet and I never had a problem with them (or so I remember from long, long ago). But I am not sure on what size to get. The bubble wall will be an air stone about 8in long. The length of the tubing will be about 35in with 28 of those inches going down and into the tank. And while I've got you -- my lfs sells penn plax air stones - they look like a light blue tubular rod with suction cup attachments --- are this okay to use? -- Any suggestions to either problem would be appreciated - thanks