I'd go with 10w-30 'dino' without hesitation esp for break-in and with your climate. By 100 hrs or so I might consider a 5W-30 if going to synthetic, perhaps a 5W-40 after 3k hrs. Really, the same with 'cheap stuff' if it makes API S'x' spec per the OM.
IMO frequency of oil change usually trumps choice of weight. Modern stuff doesn't always need 15W-40 with tighter tolerances or if low hours. $.02