Visit the Seymour Duncan website and read the ton of suggestions there. Use "search" to find posts related to smooth, warm and jazz tone questions. There are a few guys who will even help you if you post the question.
Go here; http://www.seymourduncan.com/forum/index.php?s=
I put the SD "Cool Rails" in my Strat and got a real smooth tone.
God luck with your search.
Guitars:
Electric: Washburn HB-30, Squier Tele Custom Deluxe, Jay Turser Strat.
Acoustic: Seagull S6.
AMPs: VOX AD30VT, Peavey Envoy 110.
Modelers: V-AMP 2, Digitech RP-100A.
Pedals: Boss RC-2 Loop Station, Boss CE-5 Chorus Ensemble, Digitech Bad Monkey, Ibanez DE7 Delay/Echo, DOD VFX40B 7-Band Graphic EQ, Ibanez CS-5 Super Chorus.