You can and should use SUPERAntiSpyware until the trial period runs out, then you can buy it if you like (it is much better than Spybot). If you don't want to buy it, then you can use Spybot. Spywareblaster is just internet security, not an antispyware program so you can keep that along with SUPERAntiSpyware or Spybot. Just don't have SAS and Spybot at the same time, that's not good for your system
Anything else?