That's not how Fraps works. You don't "set" a resolution, it's either the full resolution of the game being recorded or half the "full size" resolution. Again, what games do you want to record and what resolution do you plan on recording at? Your question isn't answerable because every game is different, there's no set values that Fraps uses for each game.Since I do not have the program yet I do not know what frame rate or resolutions are available.
Let's say I choose the maximum for both,what is the estimated file size ?
Yeaaah, don't go buying stuff just because its mainstream, then realizing you don't even like the product.