Hi, Storm -- CA is one of the best and least-expensive brands, and would definitely be a good choice. Norton, on the other hand, totally sucks, and caused me endless problems.
As a rule, you can install CA if you disable all of Norton's real-time protection features, and then later uninstall Norton after you've made a final decision. It is best, however, to uninstall Norton first.
Using the Add/Remove Programs panel is the best way to remove Norton; remember that Live Update needs to be uninstalled separately. If Norton doesn't uninstall cleanly, the company's website offers manual removal tools, but fortunately I never needed them.
Best of luck,