RE: Is this a good buy??
I'm lefty and I have several left hand bolt actions. Yes I've shot right handed ones for a while. But after using a left hander, I won't go back. I'm like you too - I shoot right handed semi-auto and pump shotguns and it doesn't bother me at all.
As for getting parts for a 700 - I don't think you will have to worry about that. Even if they quit making them (which is hard to beilieve). I have a lefty in .270 for owver 40 years and I haven't replaced anything on it except the scope. And that rifle has been used hard all over the country.