Dominators are very good stable pieces of RAM in my opinion
They are not the only good ones though, Kingston HyperX series with same rated specs as dominators are even slightly better.
i have little experience with G.skill
RAM i advise to my custumors normally is:
For value G.E.I.L [they got really good 1066 and 1333mhz RAM for bottom prices] nothing much for overclocking though
The RAM i got now are Kingstons 1600mhz CL8 with tall heatspreaders.
in a few reviews all people was able to overclockk these really high.
even seen 2156mhz stable on it
i am just on 1740mhz now