Rule #1: never assume that the MG amperage figures are correct. ALWAYS overestimate your current needs.
Rule #2: Since there's a spike in current draws when you turn a device on, even if your operating current is 822 mA, that doesn't mean your inrush current is also 822 mA. And it only takes a fraction of a second for certain components in an overtaxed power supply to go "pop!".
Rule #3: When speccing power supply current figures, take your MG module amperage sum, then add 1/3rd as much more to that figure. Then add more besides that. You DO NOT want to push a power supply; instead, you want that power supply to loaf along like its not got much to do. This adds up as lower operating temps in the case, more stability across the system, and less component stress.
So, given the 1140 mA figure (I don't recommend using 5V unless necessary...keep things simple), you really need something with about 1.5A to get bulletproof operation. 1A with that = BOOM! or something similarly unpleasant along those lines. And if you do go the 5V route, you're still not 100% guaranteed that that'll work...1.25A for 822 mA is more sensible.