efficiant speaker with good bass?


I am looking for a pair of easy to drive speakers that have excellent bass response for rock music as well as good imaging. At the moment I have a pair of B&W CDM-1 NT's driven by a McIntosh 6450 integrated. I need a little more punch than what I have right now. I have had 2CE's, VR4jr's, Tylers, Meadowlarks & Triangles. I loved the VR4's the most & felt the Triangles had a simular sound to the B&W's but lacked the bass.
I need to stay around $1500 used & eventually want to try some of the low cost tubed integrateds in the 40-60 wpc range hence the reason for higher efficiancy speakers. I also want to switch back to a tower speaker.
fishwater
I loved the VR-4jr's the most but sold them to "downsize", I also really enjoy the B&W's but I am looking for a change. I am looking for a larger speaker with greater impact, something I miss from the jr's.
Also, I forgot to mention that I really enjoy my B&W's & would love to stay within the line but don't feel they are efficient enough for what I am trying to accomplish. At this time I don't feel like going for a monster SS amp, I am missing tubes & if I do switch from the Mac it would only be for a tube amp.
How about a nice Vintage pair of Klipsch Forte 2 or Cornwalls...Maybe not quite as refined as some big $ speakers but all else is pretty darn good......
The horns I have heard & some of the Klipsch I have heard tend to be a bit too strident for me.