Im going to get the e4400 most likely when it comes out in late April.
I think im going to oc it to about 3 ghz, or what ever is easier for the fsb ratio (3.33 Ghz)
I need an air cooler that has these attributes:
-safe with mobo when case is in motion
-cools completely safely at 3 ghz+
-easy to install
obviously i cant get everything i want, but ive found a few coolers that seem to be the best at the $30-$50 price range that im looking in, but this one seems to be the best overall, as it shoots air downward, cooling nearby components as well as the CPU
The Intel heatsink retention system for their LGA socket makes me feel unsafe to have ANY heat sink on the motherboard under ANY condition. :?
But that's neither here nor there to answer your question.
I have the Scythe Ninja Plus and it's pretty solid (as solid as the Intel retention system can get I suppose...) and I haven't had any problems with it. The Ninja Plus is surprisingly light....lighter than my Zalman 7000Cu+ for sure!
EDITS: forgot to answer your other questions.
The Ninja Plus keeps my E4300 sufficently cool at 3Ghz, no problems.
I don't worry about moving my case around too much.
It's quieter than my average 80mm case fan...I'm very pleased with its low noise.
It's...well, perhaps not easy to install, but I didn't have any extraordinary difficulty either. I will say this much, probably on a lot of motherboards you won't be able to put it on or take it off without taking the motherboard out of the case.