I would do some shopping for a pre built from Lenovo or such.
Your budget of $340 is probably not realistic.
Your original build used a logisys case and psu that is cheap.
Be aware that logisys psu's are considered tier 5( not recommended, replace asap) on this list:http://www.eggxpert.com/forums/thread/323050.aspx
For web browsing and such, you do not need a discrete graphics card like a 7750; that id for gamers(you perhaps?)
You will also need to budget for an os which you did not include.
You also do not need a quad core cpu.
The Intel G530 would be fine. $50
Any socket 1155 motherboard will do. $50
Newegg has a corsair CX430 on sale for $17!! Good psu too.
A cheap case is OK $25
I don't think I would buy a refurb hitachi drive. Their reliability is not the best:http://www.behardware.com/articles/862-6/components-returns-rates-6.html
Do you need to add keyboard, monitor, mouse too?