hello there, I'm looking at the imacs in the refurb store and can't decide which to get; I've read through so many benchmarks and opinions that I figured I'd try to get a direct line of communication from a group I'm currently in grad school and will be using it mainly for coding, browsing, playing music, e-mail, and probably video conferencing/skype. I also plan on using it though for the occasional game (some of my favourites are gta 4, cod, xplane) video editing, and maybe running a vm. I've pretty much got myself set on the 27" model but can't decide between i3, i5, or i7. I definitely can afford up to the i7 but for games will it make a difference of many fps between say i3 i5 and i7? From some things I've read it seems like the i7 is technically more powerful on paper but many program don't take advantage of it? Would it maybe be a better idea cost wise to just get the i3 and max out the ram? Help! Please!!!