Moving from the Brooks T7 to something for a marathon. Any suggestions?

I’m too late, but was doing research on the same issue. A lot of stores are having issues keeping the Launch in because it was discontinued and then brought back due to demand. Online is the only way to go if you feel comfortable with that route. http://www.brooksrunning.com/Brooks-Launch-Mens-Lightweight-Trainer/1100651D007.080,default,pd.html?start=7&cgid=mens-runningshoes-neutral and they do free shipping and free returns, even if you wear them. I picked some up, tried them for a couple weeks knowing I could return them but am sold on them. The drop is a bit higher, but for a high mileage trainer or marathon shoe it should work out nicely for you. Running Warehouse may have other colors if the Brooks site is out of the one you like best.