Pre-qualified with the following, and as my signature implies, I am
not an expert of any kind!
This is my understanding of the programs stated...
avast! = AntiVirus (AV) Program
Malwarebytes Anti-Malware = Malware Detection and Removal (Not an AV)
SuperAntiSpyware = Removes spyware and malware. Does not deal with viruses. (Not an AV)
SpywareBlaster = blocks ActiveX-based spyware, adware, browser hijackers, dialers and other unwanted programs (Not an AV)
It looks like there is a 'layer of defense' installed, and that, from what I have read, is the best strategy.
IMO, the trick to all this is managing the programs to make sure the Anti-Malware (MBAM) and Anti-Spyware (SAS) programs do not run at the same time. If SAS is run on demand, then, while doing so, temporarily disabling MBAM may be a good idea. Claims that they run together well may be a 'tad'

overstated.
You do not want programs competing with each other, and, instead of increased security, end up with reduced security!