With Intel ICHxR raid drivers you can enable write caching and increase performance of your array when writing considerably. Its more dangerous than when using normal buffering, though, so be sure to have proper backups in case you want to activate this option.
In general, its much better to buy a better SSD instead, for example Intel X25-M has many times the random IOps the Vertex is able to deliver. SSDs themselves use a technique similar to RAID0 to access the flash storage medium -- they are called multichannel controllers. So picking the Intel SSDs for a start might be preferable instead.