i suggets against dual rads, the added restriction you would be adding to the loop, will reduce flow through your water blocks and give you minimal/zero advantage over a 120.3 or a dual heatercore modded by weapon from XS
just stick to a 120.3, it will cope with your heatload just perfect mate
unless of course your set on spending stupid money on unecesary radiators
2 x 120.2 = £120
120.3 £70
modded weapon heatercore, fans (denkis), grills all in £80ish i think from US
go for 120.3 for ease