Let's get the twist out of the way: I can get a used copy of this game for $45. It comes with the turntable and the game for the 360; the table was only used a couple of times. Before the release of the game, I was pretty hyped for it, but the reviews dialed that back some. The $45 may seem like a no brainer, but that money could also go towards Dragon Age or Left 4 Dead 2, which are the last games I am looking to buy this year. Anyways, thoughts?

I don't understand why people need justification from strangers on the internet regarding buying a video game. If you want to have more fun with a game, go with your gut feeling, buy the one you like the best. If it turns out that it was a poor decision, learn from it and buy games in the future accordingly. I paid 200 bones for the renegade edition, and I think it was a great purchase. But when I was 12 I bought superman 64 full price. Everyone makes these "tough" decisions, mostly by themselves.

$45 is a good deal for it, man. Seems to me like the better value considering you're getting the turntable included. Considering I haven't played any of the games, I can't offer too much help here. Dragon Age is supposed to be great, and if you're on Xbox Live, Left 4 Dead 2 will probably keep you coming back longer than either of those games. Look at it this way, though. With those 3 games, I don't think you can possibly go wrong with whatever one you end up choosing, so don't sweat over it. Just gather all the info you can and try to come up with the best choice for you. Also, reviews for DJ Hero weren't bad by any means. I saw mostly 90% range scores, and that's pretty darn excellent for the first entry in the series, so I wouldn't let that discourage you.

If you dont get it when you can get it for only $45 then you are mad ! 
This is the best hero game . infact its the best music type game ! 
I have and have played most guitar hero games and rockband games and they get old and boring fast. But dj hero just keeps getting better and better. 
Rather than getting really annoying as you increas the difficulty this gets more and more interesting.  
Just about finished gettin 5 stars on all mixes on hard and also started on expert and im still loving it. 
Anyway what im trying to say is go and get it !

I would say that if you know the guy who owned the DJ Hero game, then get that. If it's a stranger, I wouldn't trust it and I'd go with Dragon Age

I would personally go for DragonAge or L4D 2. Or just get those and DJ Hero.