Speaker for HT

I am looking for some budget speakers for a 5.1 setup. I have a dedicated Merlin vsm system for my stereo so 2 channel is not a factor. I want something that will give me pretty good imaging. Driven by denon receiver. I have a HSU sub already that I use with orb speakers, which BTW are pretty darn good at HT. Preowned is a must. Am interested in M&K??