...TX3 EVO... costs 40 bucks more (local currency) its kinda on the height limit of the case (136mm, case supports till 137mm) and dunno if there's enough room to it with all memory banks filled and the chipset heatsinks.
Oooph, I don't know what "40 bucks" ends up being as a percentage of the cost of the T2, but 40 bucks is way more than it costs in the US.
Clearance-wise, since you're buying it at a physical store, you should be able to take one home, set it on the CPU w/o thermal paste and see if everything clears. I will agree with derFunkenstein
that the T2 is probably a step up from your stock heatsink. I just worry about the fact that it's only got a 3-pin connector. Maybe your mobo will be able to vary it's speed...maybe not. Only one way to find out.
Again, are you sure your stock HSF is free of dust? If that's the problem, then there's little reason to spend money on an aftermarket HSF.
Main: i5-3570K, ASRock Z77 Pro4-M, Asus GTX660 TOP, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod