So im upgrading my case and so im thinking of getting a better cpu cooler, either a h100 or making my own loop (which i have little experience with) but the real factor in making my choice is how much of a performance and temp diff will i get.

right now im using a ECO A.L.T liquid cooler and its ok for my overclock of 4.2ghz (1.3V and stays at about 70*C on full load for about 40 mins or so and The case im getting is a corsiar 650D; Is it even large enough to house a custom loop?
and which is my best bet for liquid cooling,

thx in advance



__________________________________________________ _________________
Antec 900, i7 2600k 4.2ghz, radeon 6970 crossfire, AX850w psu gold, 1tb wd, 64gb intel ssd, Asus p67 pro