Would love to buy a new 15 inch, 6 gb ram, 4 gen i5 intel, 750 GB (can be more from everything, but not the size for around $500-600
Right here:
Linkthere are plenty of laptops out there with those specs and that price.
You need to understand though, not all i5's are the same. The link I pointed to above is the ultraportable i5, which is good, but not nearly as good as the standard i5. Also, as with all processors, Intel makes them in various frequencies, with higher frequencies costing more.
I also think you should consider battery life as a factor when buying a laptop, especially with the new Haswell processors.