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[TheBoy]

Best approach for raid systems are mostly 1+0 (mirroring and striping although most expensive)  instead of 5..

However even with 3 disks you can implement raid 5.. Will be cheaper ..

And as an experience machines crashing on bios start up are mostly from battery problems (some critical bios parameters are lost) or due to bad overclocking.. :-/

Depends on the application, rule of thumb is R5 for system predominantly reads (as R5 is poor for writes), and R1 for system with a lot of writes.  R10 (or 1+0 or 0+1) is the best of the std levels for performance, but also the most expensive.  Needs a good controller that implements it properly as well, ideally across multiple scsi channels.

[Bandit127]

Sorry for the bump all, but the simple answer to the unreliable Raid 0 is - about £53 for one of these:
Western Digital Elements 500GB USB 2.0 External Hard Drive
Slow and a bit clunky maybe, but probably ideal for proper (...) backups.