Of course it's impossible to make an objective judgement without having all the facts but it would appear that for some Avast! 4.8 is causing a few more problems than 4.7 anyway, notably with downloads and internet speed in general. I don't know personally of any known conflicts with Avast! and DSA but because DSA is not a problem to get rid of (completely!) if you find it unsuitable why not try it with your own set up and see? Again, because of the way DSA works and its reasonable resource consumption I don't think that it would be either a drain or overkill.
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