New PSU

Right so I bought an XFX HD4890 XXX got it delivered and excitedly installed it in my rig then realised that my psu is a bit naff and can't power it! So i need a new psu with both the 6pin and 8pin PCI-E power cables but I'm on a budget because i spunked all my money on the card, I have found 2 similarly priced (ish) but both very different, which do you suggest? (i've only just started researching psu's so my knowledge is limited!

Corsair 550vx

http://www.dabs.com/products/corsair-memory-550w-vx-psu-4Q0T.html

or (off brand 800w)

http://www.aria.co.uk/Products/Comp...+Arianet+Black+HE+Gaming+PSU+?productId=35821

consair

Are either sufficient? looking at it i don't think the aria one has an 8pin pcie. Is the Corsair one powerful enough, at some point i will upgrade my mobo and cpu, also the corsair is a single rail, would a psu with more than one rail be better?

Okay scratch what i selected earlier, whats the best psu for less than £70?

consair 550w could power up your 4890.

you could get 650W if you want

the 550w SHOULD work, but the 650 will more suited, especially if you plan on upgrading processors in the future.

the 650tx last i seen was 99 shipped.

Just ordered the 650 TX! Thanks everyone!