I'd have to prefer the Samsungs over Western Digital as well. If I was going to use Western Digital (which I currently do use in my system) I would go with a black version. But really, it's more personal preference than anything, both brands are very good choices for your array.
Well see the desktop WD HDDs are not able to set in a RAID config cuz of the, i believe, repair times are longer than 8 seconds
Im going with the samsung F3
Good idea, while WD HDDs from the Blue or Black label will technically work in a RAID0 any one of them produced recently (since Nov 2009) do not support TLER (time limited error recovery) which is fine for standalone drive use but potentially causes chronic dropouts in a RAID conifguration and conveniently provides a means for WD to charge twice the amount for "Enterprise Level" RE3/RE4 models (which are the same drive with TLER enabled in firmware).
guskline and xbonez, out of curiosity, what is your performance like with those two drives in RAID 0?
I hear they are fast drives, but I'd like to know what to expect for read/write speeds with them in RAID.