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IMHO anti virus app's are a waste of time.
In recent tests, most of the free anti virus app's could not detect 9 out of 10 viruses and malware whilst the best one of all only managed a 32% detection rate. Even paid versions only managed about a 50% detection. Compare this to computer anti virus programmes that have around a 98% detection rate.
Also, let's not forget that these are only effective against known viruses and malware and, like all anti virus software, offer no protection against new and unknown malware.
See here:-
Android antivirus apps are useless, here
surely they cant hurt, something like avg security app, or lookout, scan in background etc, and they dont take it too much background memory, plus they can locate your phone if stolen/misplaced?