Look at Aegean Air first, as it only takes 20k miles to get to *G, however you need to pay attention to which carriers you fly and what booking codes you usually fly on, as A3 can be restrictive with these. Otherwise, AC would be your best bet. Normally I'd recommend BD's program as its very generous, but it will soon be assimilated by the borg mother ship (aka LH) and chances are will become 'Miles & Less.'