Upgrading my current Gaming PC

Hi ,,
I'm looking for upgrading my current PC which I built last year "in June 2010"

Here are my current components :

Mother Board :ASUS P6X58D-E LGA 1366 Intel X58
CPU:Intel Core i7 Processor i7-930 2.80GHz 8 MB LGA1366
PSU:Antec TruePower New TP-750 750W
GPU:ASUS Geforce GTX470
RAM:G.SKILL PI Series 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
HDD:Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5
SSD:OCZ Technology 120 GB Vertex Series
Case : Cooler Master HAF 932

What I want to upgrade :

Make Raid 0 "by another same SSD" 2 SSDs Raid 0

Make SLI (I'm not sure either to upgrade to SLI with 2 GTX 470 or just buy one GTX 590??)

Add another WD Caviar Black WD1002FAEX 1TB (Don't know which is better to add it as slave or as raid 0 , but this HDD is for storage)

And due to those upgrades I think I have to change the PSU with better one such :

Antec High Current Pro HCP-1200 W or

Antec TruePower Quattro Series TPQ-1200 OC or

CORSAIR Professional Series AX1200 1200W

Please advice ,, please specify : brand and models + why .

Thanks .
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