You are correct, an increased

You are correct, an increased budget will not future-proof you.  The reason that I even mentioned it is because you asked about cameras that perform well in low light.  I was merely pointing out that within the budget that you specified, you're not going to find much in low-light performance.  As far as cameras within your budget, again, Sony would probably be your best bet.  Look for reviews on the HDR-PJ340, and see what you think.