Unless you take a 'very' high high ground with regard to artist's rights, you 'own' the right to listen to your LPs, and therefore can make cassette (who remembers those

), mp3 or other copied media for your own use. Actually ripping Lps is a pita (and you don't have a tt any more so not an option) but as long as you keep them, perhaps a friend, relation or work colleague has cds of the same stuff you could rip?
If you sell them, use the money to buy the cd of the ones you still like to hear. Rip them and put them away in the attic. No need to have a cd player, just plenty of hard drive space so you can change the stuff on the iMod occasionally.
Unless lossless down loads become readily available you will never benefit from the full potential of what you have never mind $3000 of monoblocs, unless you by 'proper' cds and rip them.
If you pay top money for boni-fide down loads, you aren't getting your money's worth because the bit rate isn't good enough.
Lots of stuff on the internet to testify that ripping cds properly does not compromise the quality and in a lot of cases testimony that the actual playback is superior -EVEN when re-written to blank cdrs....
Go figure. Better still borrow a few and experiment.
Jim