Best wishes for your surgery, Alex. Your call will be right for you, but if it were me at your age I'd definately go mechanical...heck, I hope to go mechanical at my age (60), and I'm always banging myself up with hammers and saws, bumping into things, stumbling around semi-stewed, etc.. Don't worry about ACT...Ross will beat you over the head until you get it right.
Cheers,
Jim
Cheers,
Jim