Best software raid 5 software?

[Gabriel Rossetti]

Hello,

I am about to switch to software raid 5 for my personal server. I know 
hardware raid 5 is better, but being a student I'd rather not invest in 
a raid adapter now, plus my cpu is being used at about 0.0% 24/24 7/7, 
so it needs some exercise :-)

I've heard of several software-based raid-5 projects, mainly of Vinum, 
has anybody tested it or any other ones?
Which would you suggest?

Thank you,
Gabriel