Looking for speakers for my 4W SET amp


I'm looking for some speakers with very high sensitivity for my 4W SET amp.  This is for a 2nd system so I'm not looking to break the bank.  I'm looking into Zu Omen Dirty Weekend, Omega Junior XRS or maybe a DIY project with Audio Nirvana or Lowther drivers.  I've never owned single-driver speakers before and I'm a little nervous to take the plunge.  Any thoughts?

thanks!
adam8179
Get a used pair of Klipsch Heresy's - Mk1 or Mk2! They can often be found on EBay for about $400 - $500 + shipping. Sensitivity of about 99 db! That's where I bought my pair. My SET amp is a Sanei 560A with 2A3 tubes and all Tango iron, made in Japan.3.5 wpc. The Heresy's will KILL any of those single-driver speakers! They are capable of rocking out with just a few watts. Sure, the design is old (1957) but Paul Klipsch got it right!
Another vote for Omegas.  I've spent time with Heresys and if you want to "rock out" then those should be considered as well.  The Omega's have a purity that the Heresy's lack, but the Heresys will definitely play louder and do a better job of unravelling complex music if you listen at higher volumes..

I've got a pair of the Zu DW's as well, they are closer to the Heresy sound.  A little more raw, more bass, but they are fun, especially if you want to just turn the volume up and spend less time in the listening chair enjoying the nuances of a recording.
Thanks guys.  I think I'm leaning towards the Omegas.  I listen mostly to jazz and classical so I think the Omegas would fit the bill.  I'm looking for a clean detailed sound with good separation of instruments and 3D soundstage.  Any thoughts on which Omegas?  I initially was drawn to the Junior XRS but now I'm looking at the Alnico monitor and the high output 3s.  Would they have enough bass without a sub?