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would that be correct?i know that the pump after the reservoir will generate heat into the water before going into the radiator...but i am just trying to find a way of comparing "experimental" data from my bios with calculated data from my equations...
That would give you a reasonably accurate figure (probably to well within one degree, depending on the pump used) for the heat difference between the CPU heat sensor and the CPU water block outlet temperature. I'm not sure exactly what you can do with that however, unless you're comparing thermal grease or something.

if i use Tin the water temp into the res...and Tout the cpu temp...would that be correct to find W for the radiator?
No, as that assumes the outlet water temperature is going to be the same as the CPU sensor temperature. This is highly unlikely.

The problem you've got here is insufficient information. If you had a fairly accurate flow meter and a pair of accurate thermocouples (one each at inlet and outlet to the CPU block) you would be able to calculate accurately the heat dissipation of the CPU. You should be able to get these temperatures by moving the thermometer you already have around the circuit, and the flow rate is probably best got from one of the pump head curves on here - you're unlikely to get your hands on a decent calibrated flow meter easily.
You can repeat the process for the radiator to figure out how much heat you're dumping to it fairly easily. The difference (probably very little) will be what you are adding to the loop from the pump and the like.