Are you kidding me with raid1? Why not raid 6? raid5 is too glitchy
You sure a single quad core will be able to cut it?
Honestly, MySQL is so terrible when it comes to threading performance for large table queries that a dual core would work just fine, as long as it's clocked fast enough. E3-1230v2 is 3.3 ghz (3.7 turboboost) per core, which is a more than 50% increase in raw clock rate than the current 2x quad core processors it's sitting on (also 6 year newer CPU architecture). The new server is being tweaked in a lot of other ways too prior to the migration.