[guesswest]

It's definitely flawed thinking. It's not so much that the animals wouldn't be killed, more that they wouldn't exist in the first place - they're bred for meat. That's not to say eating meat is unethical, it's a much more complicated question than that, but thinking that it 'wouldn't make a difference' is not a good reason at all if you do think it is unethical.

As far as what you'd eat goes - just whatever. I often say, as a vegetarian, when people ask me about this - that if you imagined not eating meat for one day it'd be a trivially easy thing to do. You just do that - then do it again the next day, it's way easier than you'd imagine.