ross are not the best, the problem with ross pistons is getting the clearances correct, they make it a little awkward, even when ross themselves tell you the clearances to run they arent always correct, this is from what i heard, i my new engine builder prefers not to fit them.
my new engine builder recomends people to use wiseco or wossner pistons, as these are the best performing and reasonably priced pistons.
he said je pistons are very good, but he cant warrant the price of them as his personal opinion is that there no better qaulity than the wiseco or wossner pistons.
as for rods, the pauters are probably the best, but again he says for the price of them, and for the power capability's compared against the scat, (and even the cheaper rods that look identical to scat) he says there not really anything in it, he said as long as the rods come from a reliable source, and has real ARP bolts, then theres not really much of a difference.
basically it's down to the budget you have.