I own, and my wife drives a 2006 EB w/V8, we both love it, has plenty of power, plenty of space, and can tow a house...
The only thing I wish we did was get a 2007, for a few reasons:
1. The 2007 has its door handles located in a better position on the inside.
2. The 2007 has auxiliary input as standard so I can plug in my Zune and listen to tunes instead of having to burn an MP3 cd...
3. The 2007 doesn't seem to have had any of the transmission bump/thud issues when starting from a rolling stop (mine did, but I had the computer flashed by the dealer and it's yet to come back, 15K and counting).
All in all, if the 2006 is a great deal, go for it, but I would hold out for an '07 if I had it to do over again.
Best of luck!