Amazon.com : Topeak Turbo Morph Bike Pump with Gauge : Frame Mount Bike Pumps : Sports & Outdoors
We have one of these; is not slow to put 100 psi into 38-622 tires on our tandem. A standard floor pump is faster.
CO2 leaks much faster than compress air - if you need to top off once a week with air, then you will need to do so daily with CO2. It takes a LOT of CO2 if you are going from empty to full on a tire. CO2 is most effective for topping off, because it is stored at such a high pressure, there is not very much difference in flow rates between initial filling and 150psi.