I was at my favorite gun store and saw a S&W Sigma in either 9mm or .40 for something like $279 after rebate. The salesman took it out of the display case, and let me try it. I was simply not impressed, and the salesman was not either. He was in agreement with me that I'm simply not at a point in time where cheaply made firearms are going to make me happy, and that I'm simply going to regret my purchase and end up simply putting the Sigma in the back of the safe only to be taken out every once in a while.
We both agreed that I would be better off waiting until I have the money to guy a Glock, an M&P, a Sig or an H&K. I am going to agree with him on that one. I have only bought one gun new, the rest have been used but in good condition. I go there and look about once or twice a month to see if anything new comes in. Sometimes new things come in, other times its pretty much the same stuff.
But when $150-250 means the difference between settling for something and enjoying it for your lifetime, its worth waiting for the nicer gun. The same can be said about cars, computers, or whatever long term purchase you might make including appliances. $100 extra for the nicer Refrigerator is worth it if you will use the extra features.