Ok what I'm understanding is that it would be cool to get a 50mm lens... That actually comes in most of the kits that I've looked at... Other ones that I seem to see in all of the kits I've seen online are the 18-55mm, and the 70-300mm. What should those be used for?

Anyway those 3 are included... IN ADDITION... I'll be probably investing in ONE ADDITIONAL one for now that will get me through at least a year of doing portraits, creating actor and modeling portfolios, and the occassional event (weddings, and parties)... Which ADDITIONAL ONE lens should I get that will produce excellent pictures? Thanks.

So far you've said the:

Tamron 28-75 f2.8 &

24-105mm

What do you think?

Also in regards to the comments about buying into the system... Is it true that all cannon lenses fit on each other? All nikon lenses fit on each other... So if I buy lenses for the canon 50d right now... Whenever I'm ready for the cannon Mark III... will I be able to put the lenses that I've used on my 50d onto my Mark III?