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touching pretty close to the north bridge heatsink.
Is it touching or not? Are you sure that the stock cooler doesn't fit on the motherboard? That sounds a bit odd to me. What motherboard?
Also, if you're happy with the actual performance, why bother upgrading?
the thermalight is out of stock and the xigamatek is'nt on the ocuk site.
Thermalright ultra exteme can be had for £37 delivered, may get your 5200 to 4ghz
or a good budget one is the Xigmatek HDT-S1283 £20-£25
The cpu isn't worth much more.
Arctic Cooling Freezer 7 Pro seems about right for this, buying a cheap processor and sticking an expensive cooler sort of defeats the object.
i have a e5200 and it runs at about 65c @3.75ghz