It depends on what you prefer in a meter, really. The first set of Rapture Irons is available at 25 for, ironically, 1400 credits. But if you can handle a faster meter, there are better. The Burner set at 22 is a better set for 900c if you can handle a 50% meter. Otherwise, you can also wait until 27 and get the Burner Plus set, that is more precise than the Raptures and more forgiving than the Burners. Has a slower meter than the Burners, but faster and cheaper than the Raptures.
I myself played the Tour Plus set (Driver, Wood, Hybrid, Irons) all the way to 48 and the top end Raptures, but they are pricey at nearly 3000c for the Irons and 5400c for the full set.