Should i pull my son up on this?

My son's birthday is coming up soon and as he's hard to guess for I always end up asking him if there's anything he wants, after mmm'ing and ahhh'ing I suggested a video game and he immediately asked if he could have advanced warfare,
I had a hard time finding it but he said I could find it on Amazon for around 18 pounds which is far less than I normally spend on videogames for him, I ended up getting a different version of the same game which was more expensive which had extra guns and bonuses and things like that which was nearly 30, then he turned to me and I was ordering it and saidz, that's the good thing about the Xbox one being out, Xbox 360 games are a bit cheaper which is cool
I always find it hard to tell when he's trying to make a point or not so I never know when to pull him up on something, he said it in a perfectly innocent tone as he does but I can't help feel like it's either a dig at me not buying him an Xbox one ( which I can't afford and if he wants one he's old enough to get a job ) or that he's being ungrateful and saying I'm not spending enough money on him, or just a throwaway comment with nothing behind it, but recently, since my last relationship ended in second guessing everything, even a tiny bit of parenting like this, and every sentence seems to have another meaning, what do you think, am I putting my own insecurities onto this sentence?