Durn! It seems everywhere I look there's a box set that beckons Pondering my choices now, but I sense the scales tipping.
There are six (!) box sets in the 50th Anniversary Godzilla Soundtrack Perfect Collection series, which contains (the arguably definitive versions of) all of the Godzilla movie scores from 1954 to 2003, including David Arnold's score for the 1998 movie (same 2-CD program as the LLL release).
And yes, it's a pricey venture, indeed. We started with the first box when it was released in '04 and gradually accumulated others over the intervening years. The only one we don't have yet is #6, and it's the only thing I put on my Christmas list this year.