I know I'm probably repeating everyone but really pick up a new hobby that you never had time to due. I built my first computers in those days. Don't fret, cause it all goes away with time.
Budget?
Just finished mine recently and it was only 740$
AMD 4100 - quad core amd3+ 3.6 ghz
Coolermaster- Enforcer
gigabyte motherboard for 120$ ( sale normally 180)
600W psu antec - 120$
radeon 6870- local store for 150$
15$ dvd reader/burner