As a hydronic design engineer, for residential systems I ALWAYS zone with pumps.
In the past circulators use to cost more than zone valves, but that is simply not the case anymore. Manufactures like Grundfos, Taco, Bell & Gossett, etc all make cartridge circulators that should fit your application (pump sizing still needs to be performed however). You can buy a zone circulator for around $80 and a zone valve of any decent quality is going to run you in the neighborhood of $70. Not to mention having multiple zones, if one pump does happen to go down, you still aren't dead in the water.
The second item is simplicity (pump zoning) - Thermostat calls, pump turns on, boiler starts. (Valve zoning) - Thermostat calls, valve actuates, end switch makes, pump starts, boiler starts.
The third pro in pump zoning is the simplicity of controls. You do not have to run extra wiring for zone valve end switches.
This is overly simplified, but I can honestly say I haven't designed or quoted a RESIDENTIAL job in years using zone valves...and there is a reason for that.
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