The size you need is about $80.
I know that seems odd, but labeled wattage isn't so useful these days on higher-end rigs, as even name-brands like Enermax have peak load ratings instead of sustained. I could've said "20A of 12V rail power" but then you'd have to weed through each supply to figure out if that was sustained or peak power.
If you want a lot of eyecandy in your PSU too, frills like detachable cables and sleeving, etc, then tack on more $$ to that $80. You could get by with less, lower margin and less upgradability, but since you already asked about that issue it would seem you want it covered.
Just don't buy based on "low noise". If you need that many watts your power supply is producing over 100W internally and will benefit from ample airflow. If you have extraodinarily good positive case pressurization you can more easily shop for a low noise unit as it's being assisted by the case in exhausting.
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