experience at buying 2nd hand goods has nothing to do with whether you have owned a dslr.
buying is an entirely different thing from photography.
it's simple logic, if you think the price is right, why do you need 800 other people to tell you it is wrong?
if you think it is wrong, why do you want 800 other people's opinion to see if it is right?
in the end, it is a zero sum game, i find all these "ask your opinion" threads so very pointless. might as well ask whether you should date a girl and list down all her characteristics, what you have done together, and ask people to decide. so let's say if she has armpit hair and a big mole, and you like those, and the rest of the world doesn't, who cares? you like it right, the decision already has been made when you asked people's opinion.
just look in B&S at the going rate. if it is higher than the going rate for body only with 2 year warranty, then don't buy. if it is lower, then quickly try to secure a deal while being polite and not too pushy. if it is on par, then there's nothing to sweat about, right?
it is THAT simple. you don't need to own anything to learn how to buy it. :dunno: