Shouldn't see much of a difference unless you stop frequenting and hard right now, which will make your rotors hotter and perform worse. You should put in a dual disc brake set-up on the front end if you need a lot more stopping power.
Added: Make sure you know those pictures aren't what your going to get for $50. You send your own rotors in (that was obvious) but also the pictures he's showing you are of his 72 hole rotors which are $85 for that service and the $50 rotors only include 36 holes.
Please use the search button, there are SOOOOOOO many threads about this.