Your ski boots' fit matters! Avoid both the loose fit, and the painfully tight, to best avoid a lousy day. Find the best boot fitter in your area (or at your favorite resort), review all your options with the fitter, and sacrifice no affordable expense to achieve the best boot fit, personalized to your foot.
Don't forget that you can get great advice locally and still shop around for the best price on the ski boot brand you choose! Take the advice of your expert and buy online. You'll be sure to get the right brand and model and you are more likely to get a good price.