I dont recommend you buy this for the simple reason, if it breaks you will find it difficult finding parts for it. if you really insists then upgrade the warranty to 2-3 years.
What are you talking about? Sager's don't use parts that are any different than what any other system uses; CPUs, RAM, HDDs, etc. Any of those parts that you can find on newegg.com, will work just fine. I got a 1 year warranty on my Sager (now over 2 years old), had the screen hinge break and was able to get a replacement FROM THEM in under 2 weeks. Sorry, but you get a big: