Hello and welcome! (just how old was that laptop? lol!)
I have the X51 also, its a great rig for the price, sleek design, great performance, runs cool, small enough to fit on my bedside locker
It was actually only 3 years old, but it was more of a business laptop, so it was a bit bulky (I may be slightly biased here though, since I love my X51).
How are you finding the noise it makes while running?
I had seen a few people complaining about it, but haven't really noticed anything myself.