yeah, if you shoot event footage, why don't you keep the a1 around and set it up on a tripod somewhere to get your wide shot coverage? the fact that it doesn't have a recording limit (running 2-3 hours to tape) and the 7d doesn't really excel in wide establishing shots anyway, plus that it can't hurt to have extra cameras in event coverage make that seem like a good choice. and you probably wouldn't need an adapter for that so you could sell the sgblade and use that money towards the camera.