You certainly have time to buy new running shoes. Since running shoes are made of synthetic materials, they do not require a break-in period.
Your feet may need a period to adjust to the new shoes, however. Some shoes will be perfect for your feet. Others may have poor stitching in the inside and require you to put a band-aid between your foot and the rough spot. In addition, you may want to experiment with an insole replacement. You will only discover these rough spots and insole requirements by buying your shoes soon and putting some mileage on them prior to your marathon.
Your choices of shoes (Asics and Saucony) are two of my favorites. If you know three things -- your mileage, your frame, and your arches -- then you can use a catalog from www.roadrunnersports.com to pick an appropriate shoe for you. RRS also provides user comments about each shoe at their web site. For insoles, I like those from Spenco but you won't find them at RRS.
BobZ of this forum has noted one problem about picking shoes based on your arches. He has had his gait analyzed and he has determined that his pronation style does not match his arch type. So you might want to get your gait analyzed before picking a motion control, stability, or cushioned shoe.
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