I agree with Redxj.. probably best to sell the big ring separately as it will appeal to more buyers (i.e. you will include those who have merckx with record crank already and would like a pantoed ring but don't want to buy a whole crank they don't need). You should be able to get $50 for the big ring assuming it's in decent shape, $75 for the cranks and maybe even another $25 for the small ring if it's in decent shape.