how many antispywares is too much

Hello, I have Spybot S&D, Spywareblaster, and Trendmico PCcillin is my AV. Ive had AdawareSE in the past, but removed it since it was only finding tracking cookies, and I didnt know if I should have that and Spybot together. But its ok to have both of them, from what Ive heard, right? I mean, I dont want to have too many, but now I only have one that actually scans, if you dont count the tiny scanner in my TrendMicro. Plus I have Yahoo antispy on the toolbar, which isnt a 'real' antispyware. So Im thinking on reinstalling Adaware,...but Im not sure just yet. I dont think it would hurt, but it hasnt found anything major. But then, maybe there wasnt anything to find. Those 2 together dont take up too much space, Im guessing. Any ideas on this??