let me ask you something, of custom24 and standard 24, which has a more natural strat like tone?
Hmmm... I wouldn't say either is particularly strat-like, due to the fact that from a construction perspective they're both everything that a strat isn't (humbuckers vs single coils, mahogany vs alder, set neck vs bolt on, etc). That said, between the two, the Custom 24 would probably be a better choice, since the maple top would make the tone a little brighter and potentially more strat-like in the split positions (let me put it this way... funk sounds better on my Custom 24 than my Standard 24).
In all honesty, though, if you're looking for a PRS with strat-like tones, your best bets are either the Swamp Ash Special or finding an old EG. While they've got humbuckers, they're both 3-pickup guitars (H/S/H for Swamp Ash Specials and some EG's, H/S/S or S/S/S for other EG's), have similar body woods to strats (alder for EG's, swamp ash special should be pretty obvious), and have bolt-on construction. Tonally, they'll be closer to a strat than any of the Standards/Customs.