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You need to define this a little more. In terms of temperatures, the difference between pumps is pretty minor compared to the difference in ambient temperatures that people have. Specifically, going from the 1048 to the 1250 generally means a change on the order of 1°C, yet people have room temperatures that range from 18°C to 25°C. Unless that extra °C means a lot to you, you'll do just fine with a 1048.
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My apologies for not being more clear on this subject. Let me rephrase a bit what the general idea of mine is for this project..
First off, I think the room temperatures will be around 24°C to 25°C, though I'mna to try my best to ensure that the systems will be in an environment with cooler air. However, these computers will not be tremendeously overclocked, so the need for
extreme cooling is not present
at the moment. Now, why two radiators and the works, then? I am aware that two rads is an overkill for the kind of a setup we'll have for the moment, however since these things will be built inside — and partially outside — of a Lian-Li PC-60 case (they're the perfect size for the compartments they'll be in; those compartments also possibly allow the comps to be in cooler air than the rest of the room), and stored inside a special compartment, I plan to build so much overcapacity into the cooling system that
when the time does come, in the future, to exploit the 100W+ CPU du jour and the 75W+ GeforceFX killer to the umpteenth factor with pelts and all, there wouldn't be a need for more extensive case modifications and the cooling system would be able to handle that with simple upgrades like switching the pump to an Iwaki MD-15/20 or the equivalent. It is also my hope that with that overcapacity the system would be able to run currently without
too hefty (and noisy) pumps and with quiet fans.
A lot of this system is being built for the future rather than the present. That's why I'd like to know whether a small pump like the E-1048 would be sufficient for now. I'm also toying with the idea of ditching the (hefty, copper) passive heatsink on the northbridge and replacing it with a waterblock, though I assume that would mandate an E-1250 as a minimum to ensure proper water flow.
At the moment, this is what I've envisioned the ordering of the setup to look like:
=> fill/bleed assembly => pump => CPU => GPU (=> NB?) => Rad 1 & 2 =>
..though I'm working on what'd be the best way in this instance to execute the fill/bleed mechanism, so any and all of it might change. Any comments on this?
(also on the subject of quietness and the sources of noise in the system, the hard drives are silenced by suspending them from the frame of the chassis with elastic bands — that'll keep them fairly quiet 
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