I have an Onkyo 818 and recently purchased an Emotiva XPA-3 for my front 3. I'll be adding a set of front wides now but I'm wondering are these typically considered more of a surround speaker or an extension of the L/R? Is it vital to have the wides be in the same speaker family as the L/R? I'd like to use something cheaper if possible, I'm currently upgrading my front 3 and would rather put more into those than spend too much on the wides. Thanks for looking.