I've been shooting the Ace Express 165 for several years now and am very satisfied with them. I like the extra width, length and the straight edge is easier for me to sharpen. They sharpen nicely, get very sharp and seem to hold the edge very well. The Express probably isn't as tough as the Standard with the triple thick tip, but I've not yet managed to bend or break an Express.
The STOS and Griz are clearly good broadheads, but esp for the whitetails I'm hunting I much prefer the wider head. If you really want to up the weight, the 200 gr Ace Super Express is another great option.