Tboooe, I have about 38,000 songs (2,800 albums) in Apple Lossless which takes up about 900 gig. FLAC would be about the same. You can buy a Buffalo 2 Terabyte NAS device for about $1,300 which would give you 1.5 terabytes in RAID 5, or add another one terabyte storage unit to the one you have for about $600. Relative to the rest of your system that seems like a small price to go from lossy to lossless, and given the quality of your system it's a shame you are listening to compressed files.
Unfortunately you would have to re-rip.
Unfortunately you would have to re-rip.