RAID, Stripe Size Dilemma

[SFaznSpEEdSTeR]

So as of now, I am not sure about how to set up my HDs. I currently have 5 Western Digital 640GBs and 3 of them are already in a RAID 5 array on a Perc 5/i with TLER enabled. Now, here is my dilemma...

Should I add the other 2 in the RAID 5 array and make virtual partitions for seperate types of files I am planning on (i.e - movies, games, OS)?

or

Make a RAID 5 array with 4 of the drives and use the last one as a standalone and short stroke a 50GB partition for the OS and the rest for games.

or (I prefer to do either of these first two first but I will also consider this third option)

Should I keep the 3 disk RAID 5 array and make a RAID 0 array with the remaining 2 for the OS and games?


As for Perc 5/i owners, I just want to make sure than I can also connect drives to the Perc without setting them up in a RAID array and have them act as standalones, correct?



Now that we have the RAID part out of the question, what stripe size do you guys recommend? Here was my plan for the stripe sizes. I have done my readings on stripe sizes but I feel it would be more helpful from members here

50GB OS/Apps: 128k but I've been thinking about 32k or even 64k
50GB Music: 128k
XXGB Documents: 16k or 32k
300GB Games: 128k or 256k
1TBish Movies: 1024k

All this also depends on the RAID array after getting some opinions from members