I use the free ones as well but I do understand why some people want an all in one package.
If you really do want an all in one then perhaps something like Kaspersky whos anti virus is well thought of. All programs have some sort of hit on performance and when you talk of an all in one I think the effect is probably greater. Try a free trial of Kaspersky and see how it goes click here download it. Delete your old AV before running the install program as running 2 anti virus programs at the same time will really screw things up.