If you are interested in a raid array and faster speeds, then you may want to consider PCI-e based ssd's instead. The PCI-e based ssd's are available with multiple ssd's in a raid 0 array one on card. The drives fit in either a PCI-e x16, x8, or x4 slot on a motherboard.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100008120%20600038515%20600110115&IsNodeId=1&name=Consumer
Here is a link to an excellent technical review of a PCI-e based OCZ RevoDrive X2 published last month by Tom's Hardware:
http://www.tomshardware.com/reviews/ocz-revodrive-x2-pci-express-ssd,2802.html
There is one more thing I should mention. There are some motherboards that have only two PCI-e x16 slots but no x8 or x4 slots. The PCI-e x16 slots are backward compatible with x8 and x4 devices. As long as you only use the primary x16 slot it has all 16 lanes available for the primary slot. That primary slot is usually for a video card. However, if you add a second device such as a video card for Crossfire or SLI or a video card and a ssd, then both x16 slots are reduced to only 8 lanes each. Both slots have to share 16 lanes. The video cards will suffer a slight performance hit of about 2% to 5%. There may also be motherboards with more than two PCI-e x16 slots that also reduce the number of lanes available from 16 to 8 if mutiple devices are used. Please check your motherboard manual or manufacturer's web site for more information about your specific motherboard. Hopefully you'll have all 16 lanes available in all the PCI-e x16 slots.
*** NOTE - I looked at your motherboard specifications. You're in luck. A PCI-e based ssd with multiple drives in Raid 0 wil definitely work providing either your secondary PCI-e x16_2 slot or your PCI-e x8 slot is free.
We should see the release of new ssd's with improved performance between now and May. The prices of older models should be dropping. The new drives would still command a premium price. I've looked at industry forecasts. I don't expect a drastic drop in prices of new drives until the year 2015.