I was in the same dilemna.
5050e is supposed to have a TDP of 45W only but i have my doubts on the actual values.

Coz the power usage chart on Anandtech has left me a lil confused, especially wrt the 45W chips.
Else specs wise it looks good and i doubt you will find it slower than a X2 5600+ in daily usage.
the X2 5600+ will be more than enough imho for any non-OCing type of regular user imho- enough power for most tasks.
It also enjoys a decent position on Tom's cpu charts, if i am not mistaken, especially in real-life tasks.
One thing is that, DDR2 800 ram will work at full 800Mhz by default with the 2.6GHz X2 5050e while the RAM may underclock a bit on the 2.9Ghz X2 5600+ as it is with all X2 chips with a 'y.5'x multiplier/odd number clock speed, iirc.
I am more confused between the 5050e and the 5400BE, both of which are not available locally afaik and wondering if either will be worth the premium i may have to pay to get them imported.
huh??? :S