You could get away with a single XSPC RX360, or 2x 2x120 rads of your choice...either would work. Depending on your overclocks, this should suffice with some 1500-1800rpm fans.
560ti 170watts @stock speeds (x2)
i5 2500k 95watts @stock speeds
437watts (most 3x120 rads handle 500-550 watts or so with good fans on a 10C delta-T)
It also depends on your case, and where you want to mount them.
What is your budget? Have you read the WC sticky? (linked in my sig below)