Finding a new hard drive.

So I'm looking to upgrade the hard drive in my laptop. I need a new external drive so I figured, why not kill 2 birds with one stone.
My plan:
-Order new 320gb 7200rpm hd for my laptop
-Remove old 250gb hd, and use an external drive case to use it as a new external drive to replace my old one, which I think is on it's last legs, it's speed scares me (in a slow way)
-Start fresh by installing vista with a vLite'd Vista home premium and reactivate using ABR.
-Get on without a hitch.

So is it possible. How easy is it, I assume changing the hard drive is as simple as taking the old one out and putting the new one in? Or is there more to it.
My biggest concern is finding a hard drive that will fit and is compatible with my laptop.

I have a HP Artist edition dv2890nr, on the website there isn't too much about the hard drive specs so I found this in my product manual:


Would something like this work, or am I missing something crucial?
www[dot]ebuyer.com/product/149432
I see SATAII and SATA300, mine simply says SATA would there be an issue with that?

I know they may seem like silly questions, but I just don't want to buy the hardrive and find it's not compatabile and have to waste time sending it back and getting another.


Cheers for the help <3

 

Definitely no problems with using that hard drive. What's really important is that the size form is 2.5" and interface is SATA. Any number that comes after SATA basically states which transfer speed it is capable of.

 

So, would it be better to get a SATA300 or a SATAII ?