I started with the Barnett Jackal. I filled all my tags that year with it. I bought the version with the scope. I shot all my deer at 25 to 30 yards from a ground blind. It is a very loud and jumpy crossbow. I had to take all the screws out of it and put locktite on them (many of them loosened after 30 to 40 shots). Even with the downfalls of this bow, it is still very accurate.
I have since graduated to Parker and Carbon Express, which are faster, quieter and much more refined.
The Barnett Jackal is one of the most bought crossbows on the market and will do you fine for your first crossbow. You can buy one on sale for around $300 easy. That leaves enough money for good bolts, broad heads and a rest (suggest the Caldwell field pod). Deadly combo out of a brushed in pop up blind! I would resist spending more money on other accessories for this bow. Save that money and buy a lot better crossbow in a few years.
Last: I would never buy a used bow or crossbow from someone I didn't know. Too many things can be wrong with it and it is difficult to find them with a naked eye.