Actually I believe the price tag on newegg.com is not so different between the two. When I bought my Dominator 4-4-4-12s, they were only $15 more than the regular XMS2. When the Dominators go on special, the price is even closer.
Stacker 830 - e6600 @ 3.6ghz - Eva 9800GTX+
X-Fi Xtrememusic - 4GB OCZ SLI 1066
Sceptre 20.1" - Logitech Z5500 - Gigabyte DS3 965p