Canon DSLR suggestion please!

Hello.
I am looking to enter the world of DSLR camera soon.
And I need your help!

I've been thinking about getting 450D, which I heard very good reviews about. However, I am planning to learn about photography as much as and as soon as I can, and I don't want to regret getting an entry-level camera, be satisfied with it for a bit, then regret it later when i would have to spend more to upgrade. I am willing to invest a bit, if it means I get to learn about photography.

I am planning to shoot mostly portraits and landscapes, and I will e travelling a lot this summer.

So considering these factors, can you make a suggestion with why you think they would be a good camera for me?

And what would be oen lens that I should have to take good photos - obviously i need to study and learn first and not rely just on the equipments.

Your comments would be very much appreciated!!