I have this cunning plan of building a 4 x 120GB SSD RAID 0 via a proper PCI-E card, good for 1.7 GB/s. Should be sweet for a system drive, ha? Might set me back about $800 after I bought the SAS to SATA cable and the 4 x 2.5" rack to keep it neat, but speed matters, isn't it? :-)
... and then there's room for 4 more disks on the second port of the RAID card... if only the bloody disks wouldn't be so expensive...