Efficient Dynamic Speaker with low-end punch?

You didn't mention a budget, but for <$1000 I recommend you check out Klipsch RF7's and the previous model KLF-20's.

Thank you all for your replies. My budget is about $4k.... I am also looking at DeVore and Proac.

FYI I have a Fostex fe206esr back loaded horn 98db 1 watt 40hz-20khz $2500 shipping inc a great deal and works very well with small pass amps.

I second the Reimer line. The bass on these go very deep and clean. My 18 tube watts matches well with the Teton's.

Silverline speakers , new and used at your price point. Average efficiency 93 - 95 db, usually equipped with some potent woofers and a very pleasant/natural "House sound". An Aleph 3 would probably be a real potentially nice combination but try and get some tubes into the pre if you could. I owned that amp years ago and liked it a lot but didn't have the Silverlines (Sonata 2's) I have now. What is your pre? and room size?