Well, both are ok.
120x3 plus 120x3 or 120x2 plus 140x1 can do the job in that rig since your don want overclock, I suggest two 120x3 radiators for two main reasons.
1) With that power rig, at some point you will want overclock it...just wait the time and you will say "hell yeah"...
2) I don't like the 140 radiators for "space".
At this point, I suggest your go with the option that represents less money for you. Remember use a Silver Kill Coil in the reservoir and don't use other products for give color to the liquid...if you want a good look, use colored tube for that.