low to mid range for settings on aaa titles.
specs on my current pc or the upgrade?
Dude a pentium will not help out much here, new or not if your on a budget you should probably look at AMD's offers, just stay away from the anthlon line and the a6, A8, A10, FX Series would be better.
If not save your cash and get yourself an i3 or i5.
Also put more cash into the gpu and less into your cpu, cpu is important but just remember its not the one that will be doing the graphics related work.
GTX 730 is a nono, for the extra cash from not spending much on the cpu, get yourself a gtx 950, and entry level gpu's are kind of a joke considering some of the high end intel cpu's (i5, i7 recent gen.) integrated graphics can actually outperform them.
windows 10
You can save a lot of cash buying Windows 7 or 8, 8.1 and using the free upgrade offer instead of buying the OS for the whole price.