A couple of more points. If you like your CD 73, you should know that the CD 92 (until this year the most recent model in the CD 90 series) has the same DAC as the FMJ. The main differences (though hardly insignificant)are in the power supply and the case. The most economical way to improve your sound if you like your Arcam would probably be to look for a good used deal on a CD 92 (the CD 93 is probably too new and will be too expensive - I believe I might have failed to make this clear in an earlier post, but I don't think the sonic differences between them are great). After selling your CD 73, you might do this for less than the $400 you wanted to spend for the upgrade in the first place.
As to putting your money elsewhere, I am a huge believer in source first, but you also can't completely disregard system balance. You might want to put the money you save towards a good economical integrated. If you can afford it the Arcam DIVA A-85 is a great choice in the $800 - $900 price range on the used market. That would give you the basis of a very sound and highly enjoyable system. You may end up being so happy youre not in a hurry to upgrade - a blissful state indeed for those of our ilk. But again, DON'T TRUST ME, trust your ears. Try to go and listen to this stuff if you can.
As to putting your money elsewhere, I am a huge believer in source first, but you also can't completely disregard system balance. You might want to put the money you save towards a good economical integrated. If you can afford it the Arcam DIVA A-85 is a great choice in the $800 - $900 price range on the used market. That would give you the basis of a very sound and highly enjoyable system. You may end up being so happy youre not in a hurry to upgrade - a blissful state indeed for those of our ilk. But again, DON'T TRUST ME, trust your ears. Try to go and listen to this stuff if you can.