Since I'm somewhat knowledgable on Totem speakers, I'll try to help.
Totem mainly focuses on 2 channel, but they are getting into home theatre more. They offer two centre speakers, the Model 1 Centre Sig and the Mite TC, and the recently released Dreamcatcher system. They also released the Lynks bipole/dipole speaker a little while back.
The Mani-2 unfortunately doesn't have a dedicated centre speaker, but I have heard of people using them as main speakers in an HT. Most use the Model 1 Centre Sig speaker. It's not a perfect match, but it works quite well. Another option is to use another Mani-2 as a centre. This route is definately way more expensive but it will give you a seamless front soundstage.
Hope this helps.
BTW, I hope you don't plan on using the SR-19 to power the Mani-2's. They require a decent amount of quality power, and no receiver is going to offer that.