When dedicated RAID controllers are too expensive, the poor man should...

So the Disk Setup Guide on the PPBM7 Tweakers page states that for 5+ drives, RAID 3/5 (with dedicated controller) is the way to go... But that's a BIG price jump from a 4 drive system.
As of now my disks are:
C: Sandisk Extreme 120GB
D: WD RE4 1TB
E: WD RE4 1TB
F: WD Green 1TB
It's not fast enough, and I need more room on the media drive (it's 50% full, but will keep filling and degrading quickly). I also want a bigger F: as a dedicated backup.
I was thinking:
C: Same. OS, Programs, Page.
D + E: 2xRE$ in RAID 0 (onboard controller) Media, Projects
F: 160GB SSD for Cache/Preview
G: 2GB Backup of media/projects RAID 0
Now, I know the risks of RAID 0 for projects (and really for my setup losing media would be just as catastrophic), but 1) they're enterprise drives which should be a bit more reliable and 2) I run a backup everyday.
Am I making sane decisions?
P.S.
My entire cache/preview amounts to 15GB, so it seems a royal waste of space to run the 2 RE4's in RAID 0 for the cache. 120+GB SSD can be had for ~$65 ebay.

Eric - Thank you! I've never heard of putting the cache on the OS drive, but that would indeed save me some money and effort if it's not likely to degrade performance.
Bill and RJ - I apologize for wording it unclearly (plus a typo), but what I was trying to say was G: 2TB Backup of media/projects RAID 0 meaning G is a single 2TB drive acting as a dedicated backup of the media drive (which is a 2-disk RAID0). I am clear on the fact that RAID 0 has no redundancy, and doubles the risk of data loss.
RJ - I understand that even enterprise drives have a chance of failure, and perhaps in my circumstances the same chance as a regular drive, but I've been using these drives individually for a good while, have error and health checked them, so they're not duds. I would backup my media from the single drive where it now resides, setup the RAID 0, then restore the media to the new RAID 0 media drive so there'd be no chance (excluding lighting, bad luck or the wrath of the almighty) of losing everything mid-backup.
So, it appears the cheapest solution for me would be:
C: (120GB SSD) OS, Programs, Page. Cache, Previews
D+E: (2TB Spanned) Media, Projects
F: Single 2TB disk, backup of media/projects
Exports on D/E or F - it doesn't really matter to me. I don't mind waiting, and they generally go straight on the internet post-export.

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