Yeah for this kind of usage, you're better off with a prebuilt PC. Yes that SSD is a nice touch but from a best bang for the buck value, you're looking at a prebuilt.
With that said, my thoughts on that build is:
- Ditch the Corsair SSD and go for the Crucial C300 64GB SSDs since they are significantly faster in real world situations
- At $130, that CPU is overpriced considering that you can get the faster and quad core Phenom II 955 CPU for $10 more. So if you want best bang for the buck value, you're looking at AMD. The AMD Athlon II X2 250 CPU is more than enough for those usages. Find a mobo using the 880G chipset.
- At $40 shipped, that case is over priced. I recommend this case: $50 - Cooler Master Elite 430 RC-430-KWN1 ATX Case