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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RL sterlings carry a premium even in sub standard condition...for those wanting to complete their Zep collection reissues serve purpose...Classic records another option.
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.