"Affordable" can span a wide range of numbers. The ol' Behringer ECM8000 is pretty popular, though, and flat enough for most purposes, from what i've read.
I "splurged" a bit for a calibrated mic from iSemCon, a year or two ago, though ;D
I "splurged" a bit for a calibrated mic from iSemCon, a year or two ago, though ;D