If the pump is not pulling any water, it is not pushing it either. It could be a return side blockage. What is the PSI of the filter? If it is high, then it is a return side blockage, if it is very low, then the problem could be with the pump, assuming you have ruled out the a suction side blockage. Also, is there air in the pump skimmer basket?
As for a new pump, that will depend on what you need it to do. I assume since it is a 1 HP pump that you are not running a spa or water feature with it. What about a automatic cleaner, suction or pressure? If the answer to all is no, then I would go with as small a pump as possible to save a bit on electricity. A 3/4 HP is probably all you need and two speed will offer even more savings.
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