Do not get the Rasa, if you going xspc get the Raystom waterblock,
In many cases were only going up by like a degree form block to block but the Rasa is 4/5 degree higher temps thenits sister the Raystorm. With the raystrom only in the 40 Dollar mark save you self the hassle. as for 140mm rads I use both the( XSPC-EX420) and the (MC-RADI420) both work well and save me space.
ps don't go chrome or copper on the full raystorm block.