I dont know what speed daemons pc are you people using but i use a lenovo laptop, core2duo 2.1ghz, 6gb ddr3, 521nvidia gpu. I dont think a dual core pc is weak.
About lxde, better use openbox.
I've some experience with LXDE and Debian 6.0 - I enjoyed it.
But, the really pure WM is i3. In my opinion, great stuff!
Have a nice day!
"If you can dream it, you can do it!" [Walt Disney]
LXDE fans might be interested in the latest offering put together by machinebacon I'm no LXDE fan but this looks like a nice release.
^ You really know how to wet my appetite, fortunately I can resist everything..but the temptation...you tempter
#!, all else is but a shadow!
May the Kernel be with you!