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each amp will have a certain idle current draw, whether that is significant or not depends on the amp. suffice it to say, there's a 99% chance that a single amp will strain your elec. system less than 2 amps that add to the same rated power.
as far as powering the subs... well, i mentioned this before but maybe you missed it. you have two 4 ohm subs. wiring them in parallel give you a 2 ohm total load (as seen by the amp). wiring them in series gives you an 8 ohm load. both amps you referenced are stable to 2 ohms, ie they'll work with a load as little as 2 ohms. in this configuration (parallel), the 610a will provide ~761 W to the pair of subs (~380 W to each). the 1210a will provide ~1516 W to the pair of subs (~758 W to each). as you can see, a single 610a will probably be fine. you're wasting your money if you don't wire your subs in parallel and instead use 2 amps.
i guess you want all infinity so that your amp and speakers match? cool if that's the case, but i wouldn't limit my options for asthetics that'll be hidden in the trunk all the time
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