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i) While the i3 2100 won't overclock, it won't bottleneck graphic card up to GTX580 level, unless we were talking about dated 1 core games like WOW and X3, or extremely CPU demanding games like Total War series.
ii) Have a decent reliable 400W ish PSU could be enough if people know their power consumption won't exceed what it can deliver, but it will not allow option for future upgrade such as higher power consumption graphic cards
iii) I wouldn't go for a i3 5xx, as socket 1156 is dead-end and no future upgrade path to SandyBridge/IvyBridge, and gaming performance wise it's quite a a bit behild i3 2100:
http://www.xbitlabs.com/articles/cpu/display/pentium-g850-g840-g620_4.html#sect0
I've seen a couple of 2nd hand i3 2100 gone for £60 ish...absolute steal at that price if you ask me
iv) We don't know what 7850 performance is gonna be like yet...lower power consumption than GTX560Ti is likely, speed wise it wouldn't be much faster than the GTX560Ti, but price is gonna replace 6950 2GB level so it's gonna be at £200 plus, so it costs more. We all have hoped that we would get a some decent performance boost from new gen card launch at the same price range as last gen cards' launch, but it is not what's happening right now- AMD is charging premium for the extra performance for the new gen card, because Nvidia don't have new gen cards ready yet (or because of their epic fail on Bulldozer and being money hungry as some people put it). £150 78xx card simply isn't gonna happen, unless Nvidia can launch their new gen card soon.
I was so annoyed when I went to purchase it!
i3's are for checking emails
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