For office apps, u might be better with a pentium CPU, or maybe even a Xeon. Also, if u want a really sturdy well built, reliable case, go for this Lian Li
http://www2.newegg.com/Product/Produ...82E16811112508
sure, its expensive, but its great.
Id also suggest a larger hard drive, like a 120, or maybe even a 160 gig. As for PSU, that one is crap. Try this thermaltake:
http://www2.newegg.com/Product/Produ...82E16817153006