WaffleGT

I am about to purchase a set of 4340 rods for my 97 Cobra that spun a rod bearing. I see name brand rods (i.e. Manley, Crower, Eagle and so on) ranging in price fromm $500-$1200. But I also see some rods on E-bay (i.e. Legend, Probe and some with no name on them at all) ranging from $319.00-$465. So what is the difference say between a $600 Manley set and a $325 set of legend rods? All have the same 8740 ARP bolts. Just wondering before I committ to this purchase. Thanks all