If forced between those two, Id take the HX.....Id rather have the Seasonic X series ... the EVGA G2 is the equal to the HX and $30 cheaper.... HX 650 - 850 are some of the best units ever manufactured....the 100 and 1050 were dogs... The HCG had a 9.5 performance rating.
10,0 performance rating on the HX850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=153
10.0 performance, 10.0 build quality and 10.o functionaility on the HX750I
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=392
So given the relative scores between the HX, Antec and EVGA G2, the EVGA scores the highest and the fact that it is $30 cheaper shoulkd make the choice an easy one.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438017