Juan,
Those are all excellent questions.
I have been using Vegas for a number of years now on my home computer and it has been terrific. It is fast, flexible and after editing commercials professionally on Avid, I have found that Vegas provides a great, great home-system alternative.
Two things.
One, Vegas has a bunch of terrific features, but most of them require a fast computer. It makes a huge difference.
Two, I have just installed another 2 GB of memory to my system, bringing it up to 4GB. I think Vegas requires at least 2 and is much better with 4. The memory in your video card is important as well.
I think you can go to Vegas Pro simply because Vegas is also an easy system to learn and it’s very flexible. If you’re used to editing a certain way, it’s likely Vegas will allow you to continue to edit in a way you’re used to.
I’d say go for it.
Cody