Hey, this is Guyspeak; there's no such thing a question that's too weird. Unfortunately, there IS such a thing as a nipple that's too weird. For an example, look no further than WWF wrestler Chyna, proud owner of nipples as long as your arm and areola as big as dinner plates.
No guy is going to dump you because your nips aren't up to snuff. We've all got weird body issues. Hell, even Brad Pitt has that vestigial tail (LOOK IT UP). So don't let it sap your confidence or anything like that. But sure, if you're sporting one dime-sized and one half-dollar, he's going to notice.
I can't tell you that there's a consensus on this, and it's certainly not the part of the female anatomy we discuss amongst ourselves (that, of course, would be the sexy sexy philtrum), so there's no real way of knowing for sure your girls will be compatible with the guy you've got your eye on.
But I honestly can't see a scenario where nipple size or color is the make-or-break for a guy, so again, don't sweat it.