If i were you I'd get on broadband and on a peer to peer network, then you can simply download the albums you need. this will save time painstakingly transferring 'em from LP track-by-track which is laborious and you will get crackle etc.
I have about 2000 Lps and transferred only the hard-to-find ones i couldnt download. As far as I'm concerened, I have already spent the money and have no qualm about copying them into another format, from other people if need be.
And don't destroy the LPS, take them to a second hand record shop ,sell them or give them to charity shops.I say Keep the older or rare ones from, say, before 1980 which may be worth something but without knowing who theyre by, it is hard to say if theyre worth anything.
Dont bother keeping LPs to 'justify' your cd versions - provided you don't go round selling copied cds on the street, who is going to know?