any suggestion for a narrow mini receiver

The TEAC Reference series are nice, the Denon DM-series are also pretty good. You could try something like a Linn Classic all in one, or the Linn (sorry, can't remember it's name) all in one for surround. Don't let the all in one concept put you of: it performs to a pretty high standard.

The Musical Fidelity X-series are great, but not that cheap, and it's not made anymore, so you have to settle for secondhand. I think, reconsidering this threat, I would go for the Teac Reference series, since it's pretty good, and you can buy new components to adjust the system to your needs (surround etc.).