I've ranked an EMD with a low comp keyword within 10 days, and its stayed there for 3 weeks so far.
But, I personally think, related aged domain is better.
Were u making some unique web2.0's and simple tier2 links? that's nice buddy
Yeah I made a nice tier 1, with good quality web 2's, and some nice social signals, all manual, then bulked loads of web 2's to all those links. SB + NHSEO + GSA -ed all the links. Very simple, probably overkill on such an easy keyword.
EMD variations are working fine for me using (aEMD) and (topEMD) have been ranking #1 for a website script since April.
Modified above example:
Your keyword is "electric toothbrush"
Your url can be "aelectrictoothbrush"
Your url can be "topelectrictoothbrush"
Dislike having more than 24 characters in my domain though.