When my striped RAID array failed I just replaced a disk and restored my data from a backup after recreating the array (and losing all the data on it in the process).
I've read but have had no personal experience that standard consumer PC's are very fussy about reading a RAID array and it's often not possible to read them in another PC or on another motherboard.
Depending on why your PC broke it may be cheaper to fix the problem and try to read the array from that unless it was the disk(s) that failed.
I've never heard of this company but they are based in Oxford click here
I've also read that this company provides a good service but they seem to be based in London click here