Re: XFCE vs LXDE
I have experimented with both. Of the two, I prefer XFCE. And yes, it is a bit like gnome 2, though lighter.
I would guess that the resource requirements are not greatly different. Perhaps more disk space for XFCE.
You can have the XFCE panel on top or bottom - maybe that's also true of LXDE (not sure). With opensuse, XFCE will start with the panel at the bottom.
And no, LXDE does not seem KDE-like in my opinion.
I was able to do more tweaking with XFCE (compared to LXDE) to get things the way that I like. But that might depend on what you want to tweak.
Note that I currently have KDE, Gnome, XFCE and LXDE installed here, though I mainly use KDE.
opensuse 13.2; KDE 4.14.3 (main desktop and laptop);
opensuse tumbleweed; KDE 4.14.3 (test system);