Hi...
If I could make a 2 suggestions for your system.
#1, In lieu of the Seagate hard drive, look at the Western Digital "Black" series if the cost is comparable with the Seagate. Several have noted some issues with recent Seagate hard drives that could cause you problems to resolve.
#2, If you are open to ATI video cards...there are positive reviews on the ATI Radeon HD4770. There are several different manufacturers using this chip...and all have very good price versus performance.
#3, You might wish to consider Windows 7 in lieu of Windows Vista. Even Windows 7 basic seems to have more features than Vista Basic.
Also, You can download a legal RC from Microsoft of Windows 7 64 bit ....good until this time next year....so you can save money on the OS and put it on hardware.
Windows 7 Release Candidate Customer Preview Program
Good luck and best wishes with your new PC.