Rip them to FLAC or WavPack and your favourite lossy compressors at the same time. Yeah, there are programs to do that, and they integrate nicely with Exact Audio Copy or your favourite ripper (as long as you use a serious ripper, that is, not iTunes or WMP or things like that). Put the CDs in boxes and carry them to a safe place. That's what I would do in your situation.
Why keeping the CDs? If a disaster strikes, you still have your CDs and can rip them again (well, it's a nuisance for the time that takes, but it's better than buying EVERYTHING again. Or not having any music). With FLAC copies you can do everything, like backing up to an external HDD, and listen only to the lossy ones (if you used a properly configured compressor, and a good one as well). If later, you decide you want to change to AAC, for example, you can easily convert the files to FLAC to AAC in no time (if your computer is fast enough), which is way faster than ripping everything again. And with lossy, you save space in your main HDD and you can put them on your portable player.
Incidentally, now I'm the middle of ripping my CD collection to FLAC as well. For now, as I don't have an external HDD, they'll remain in the main HDDs, but later I'll convert everything to Vorbis, and call it a day :). It's going to take some time, though, I have several CDs not present in the AccurateRip database, that means I have to rip them in EAC's secure mode (sloooow).