First off I'm sorry for posting, apparently this is a common post and it's annoying to the normals?
Anyway, the reason I'm asking, is because a want a Mac that runs damn FAST, gets everything done, with a minimal wait for tasks to be performed. I
MAINLY want a Mac that can run all new releases of the Mac OS for
at least 5-7 years. That way I won't have to buy a new Mac until either my hardware is too aged, or a receive a bad user experience on a new OS (assuming Apple stays with Intel). You know what I mean? I don't want to have to buy a new computer/update hardware every couple years for a new OS!
If anyone is wondering what exactly I'm using the computer for, these are my daily apps that are running at ALL times (on two monitors):
Finder (duh)
Safari
iTunes (always playing in the background, unless editing footage)
Mail
Twitter for Mac
Pages
Todolicious
These are running quite often as well, but often run quite sluggishly while the above applications are running:
iMovie (editing videos for school all the time)
Handbrake (backing up my movies to watch on my AppleTV)
GarageBand (making recordings with my band)
iPhoto (importing pictures from my iPhone 4 and iPad)
What Mac is necessary to run all the tasks above at once with NO lag?