1. More RAM is very recommendable
2. I would go with Intels mobo, if I were you. Try to look a mobo from Gygabyte, ASUS or MSI
3. HD5830 sucks, get a GTX460 or a HD5850.
4. Care to consider X4 965 or X6 1055T?
Well...basically I just making a recap of all tose suggestions above, which I also agree.