The i5 2500k is $95 more, on Newegg.
I think the i3 2100 is just fine for your purposes, especially considering that you need to add Win7 into the budget.
is a side-by-side comparison just for reference.
While the 2500k is obviously more powerful, the 2100 holds its own just fine.
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X