Classic rock: best remasters


For rock fans just curious what remasters, recent or otherwise, were a quantum leap over the original vinyl or compact disc release. On the flip side, any original CD releases that are still competitive? Not interested in imports, SACD, etc. Thanks rockers!
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There are only two RL Zep records among the original studio albums as far as I know- LZII and HOTH; the latter is not an expensive record, II is tres cher. The Piros re-do's from the 70's are very good, and don't command much of a premium, though condition is always an issue with any old record.
I like some of the UK Deep Purple remasters; especially 'Machine Head.' The original US CD is garbage.
Zep II and HOTH are two of the better sounding Zep releases...so I have never persuaded RL pressings...its Zep...it ain't Opera