Need Hi Eff, Omni-directional Speakers

Okay asking a lot but i have a nice 15wt el84 tube amp and my room is a narrow two story log cabin about 12x22 with a loft.

Since placement is difficult looking for speaker that will disperse the sound more than a focused sound.

second system so I don't want to spend 3K lol

prefer $500 tops used

thanks