good hedder paint

I will go to my local ace hardware tommarrrrow and ask for that stuff. I was pondering the idea of buying brand new headers as well, i can get these hedman headers used for 100 bucks plus the expense of the paint. Or i could purcchase the exact same hedman hedders brand new for 180 bucks. Or i could purchase brand new flowtech headers for 150
If i were to buy brand new wich brand would you guys suggest? i have always ran hedman with no problems, in fact the set i have on my engine now are hedman's and they are 10 years old and still working, they just have some dings in them and the paint is totally gone from them. Anyways the hedman hedders are 1 5/8 thick tube and the flowtech hedders are 1.625 thick tubing. Wich would be better? the 1.625 or the 1 5/8? my engine is a 360 magnum 300hp 375 ft lbs of torque crate engine. But i got the engine dynoed and its accually putting out 319 horse power and 424 ft lbs of torque. I want the hedders that will give me the best low end torque because this engine is in a four wheel drive truck , so would the hedman hedders give better torque or would the flowtech's give better torque?