Twilight is a great machine but is complex to work on....With the economy being a bit slow, there are alot of great machines at great prices.
But remember, pinballs are extremely complex so it doesnt hurt to just buy one in refurbished condition that is "ready to play" and give you and your family many hours of great fun...with professional sellers like Mark C from melbourne, check out his prices for a finished machine before you price up a project (or nightmare)....some machines start for a few thousand and alot of titles can be had for 3 or 4 grand....twilight will be 5 grand plus all day long, no matter where u find it. Fixing can be fun, but playing is better....There are alot of people who can offer help from these forums.
Give Mark a call from Child Amusements in melbourne, i am sure he could help u with a project or a "ready to go" machine.