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If you opt for Intel and want to overclock, then you would be best off with a 2500K. It's more expensive than your original AMD options, but it has an unlocked multiplier (which most current Intel processors don't have), and almost all overclocking on the socket 1155 platform is done through the multiplier. All the other unlocked Intel chips are more expensive (and the 2500K is generally what is recommended for gaming)
Also, to be able to overclock you will need a P67 or Z68 motherboard. H67 (and, I believe, H61) supports the CPUs integrated graphics but doesn't have overclocking support. Z68 has both.
Of course, if you want to just build the system and use it with no tweaking, there will be better options for you. I don't know as much about lower end chips at the moment so can't comment there
I'm on a budget of around £430 and I already have a case sorted out and a pretty decent hard drive. I was looking at videos of people using the same Intel i3 processor I would like to get, with lower ghz and slightly lower graphics, and they are managing to play crysis 2 on high settings and record it with fraps, while still getting 40 Fps on average Go on to...
