Besides a U320 SCSI controller supporting RAID that plugs into PCIe (not PCI-X), I'm afraid there's not much other option. And Cheetah 36ES is a very old generation of 10k drives, probably would the same speed as most 7200rpm 1TB of today in normal desktop usage.
Do you have a good reason of wanting RAID0? It's not going to help vastly in average everyday usage (with HDDs anyway) unless it's meant for something with lots of sequential read/writes.
Thanks for the info, il probably buy a pair of new 10krpm disks. If you have any in mind im open to suggestions, i prefer small in capacity though.
I think raid 0 will help me out a bit, i am a graphics designer and i would like to experience no-lag in photoshop, i put my money on fast ram and raid 0, in order to have a little faster system when using software.
For Photoshop the first priority is to spend them on RAM. They are relatively cheap now, 6-8GB of DDR3 can be had for under $150 which is more than enough when working with upto 5layers of 24MP TIFF images (just one of my hobbies...) and a Lynnfield/Bloomfield quadcore.
Although PS still wants you to assign a scratch space for it, with enough RAM no disk drive activity will occur (and therefor no slow down).
If you're concerned about $/GB then consider a single 150GB VelociRaptor. Otherwise a 60GB Indilinx controller based SSD (~$2.7/GB now) would be the ideal choice. For storage slap a couple of terabyte drives together and keep an external or two for backups.
Older 10k/15k including WD Raptor were simply not designed to perform at best in desktop environment. From $/performance perspective they're no better than high density 7200rpm drives of todays generation.
Problems when multitasking with SSD? That's nonesense, maybe the OCZ Core with JMicron controller; which had write latency issues. But if you want speed there really is no other option than SSD. You won't get close to this by using RAID0.
For your system drive, if you can afford a good SSD like Intel X25-M G2 80GB, you really should think about your options.
X25-M speed is about 30.000 IOps
Single HDD speed: 150 IOps
RAID0 HDD speed: 220 IOps
Still many orders of magnitude faster. MB/s is not relevant here; sequential access is fast already but non-sequential access is not - when using HDDs. So its latency and not throughput that is most important to generic performance.