Raid Controller Help

[!TIMMY!]

I currently have this HD & Optical drive setup on my DFI X48 LT T2R:

Jmicron (2 ports):
2 x NEC DVD writers

Intel ICH9 (6 ports):
4 x 250gb WD HD's in Raid 0 (data)
1 x 1tb Seagate 7200.11 (backup of data)
1 x 150gb WD Raptor (OS, apps & games)

I was thinking of getting a pci-e 4x internal 4 port Raid controller card so I can move my 4 x 250gb WD HD's in Raid 0 onto it. I use these HD's for video editing.
Then add in another 150gb WD Raptor onto the Intel ICH9 for Raid 0 with the other 150gb WD Raptor, for the OS, apps and games.

Is that my best option?

I was looking at the Adaptec 1430SA from OCUK, but I have no idea which brands are good. I also was looking to spend under £100.

What Raid card would you recommend? I need it to be pci-e 4x.

 

[rpstewart]

What about moving the Seagate to an external enclosure to free up a port? Depending on how often and how much you back up then USB might be sufficient otherwise you can get a PCIe 1x eSATA card for £10-12.

 

[!TIMMY!]

I actually have the 1tb in an external eSata enclosure so if anything was to go wrong I can hook it up to my other PC and continue working from it over eSata and not USB.

I was thinking as you said getting get a cheap PCIe 1x eSATA and moving a DVD writer onto it, moving the 1tb to the Jmicron and then having 2 Raid 0 setup's on the Intel ICH9. Would that be advisable?