if your feet are narrow enough for nikes to fit well, you might look at boots other than SPK. dalbello or full tilt run narrower. but go see a bootfitter.
I have konflicts and they're the best. But I recommend fitting the boot (ofc) before buying 'em. Just remember that they need to be on your feet for a week (depends on person) or so. My konflicts were all good in a week. I like FT cause you can change the tongues (=flex) depending on your style and place
spk are fucking ace i wear a 9 uk (10 american) and i have a 27 boot i believe. full tilts are also a good option i hear but havent riden them. i love my spk 's so watevers best hope this helps
They don't sell full tilt around here, so here's my advice. Go to the PNS ski swap, first weekend in November, ask for Mikey, and have him fit you for some boots. He knows his stuff, and he's a cool dude, so he'll help you out.