Join Date: Oct 2005
Bikes: '05 Rocky Mtn Slayer, '03 Iron Horse SGS
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You might not need new chainrings since your chain stretch is not too severe. Get new chain and cassette and see how it works. If you don't get chain skips on the chainrings, you're fine.
If you have play in your rear derailleur, that could seriously mess up your shifting (indexing). If there is excessive play, I would replace that as well...use Park Tool site for instructions on installing and tuning the rear derailleur (travel limits and indexing).