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The new pegasus is lighter (pegasus 29), and is a great replacement for your old ones. Fit will be very similar, as will cushioning. Other lightweight alternatives to look for that offer similar cushioning are the Mizuno wave Rider 16, Asics Cumulus 14, Saucony Triumph 10, and Wave Precision 13. All lightweight, all offer similar cushioning, but all fit slightly differently, so I'd recommend trying them all!
nike lunar, i switched with no problems