I have new Windows 7 ultimate to replace XP in my Compaq Persario Desk Top. I am thinking of upgrade from AMD 80 gb hard drive to 500 or 1 tb, but am concerned with info I located about various brands being less than long term reliable??? As well, I am thinking that Processor and/or complete Mother Board. If it is not obvious, I am very much a novice at this. Simply seeking the best advice to create a very good system.