Finding the right Hard Drive for my Inspiron 600m

I have a five year old Inspiron 600m and the hard drive is failing. As I understand it one must obtain a drive with a compatible interface type. Using my service tag Dell recommends this hard drive: 

<ADMIN NOTE: Broken link has been removed from this post by Dell>

Searching through the catalog I found others with the same interface type (according to the Tech Specs), with more capacity, and at a lower price, like this one: 120 GB 7200 RPM SATA Internal Free Fall Sensor Hard Drive for Dell Inspiron 1420/ 1521 Laptops -- (Even though it says its for the inspiron 1420/1521, it is the same interface type as the former.)

Am I stuck with the first one, or are there other options for me (like the second one).

Thanks