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That's the best choice since you have less picture shift and more brightness, but beware about picture size restriction. Be sure the projector can deliver the needed picture sizemove it even closer,
Nowadays Keystone is less used and it is replaced by lense shift. That's better ragarding PQ. I do not recommend Keystone.I have not purchased my projector yet, but I am looking at various used Mitsubishi models. They've had great reviews and all come with a good horizontal keystone adjustment.
Try projectorcentral for the Picture Size, it's pretty accurate.I was figuring worst case is that I would have the projector really close up to the wall and only have a 50" image.