Well to reach 3ghz, all you need is DDRII-667.
I think either kit will do because if you run it with DDRII-667, chances are you can bring down the Timming to Cl4 even Cl3.
I am not positive but I beleive these sticks are almost identical and should perform about the same with the CPU at 3ghz. But 26$ is not a lot of money to get higher binned parts.
So you won't likely get a lot more performance for your 26$ but probably more potential which might come in handy at some point.
Anyway is there any other memory available?
I would suggest
Curcial Ballistix 667C3 I think it would be better suited for you needs.