I recently bought the GPA 604-III with GPA standard cross-over. Very pleased with the result.
Used a large (200 litre, 7 cubic foot), ported cabinet based on Stonehenge V, but modded per Todd White's suggestions. Lovely Palesander veneer over double-walled 19mm ply. Rubber carpet underlay on three inside walls.
For something smaller, go with the original Altec 620 cabinet, here.
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