Well if your going to have an installer solder it in, get the X2 lite.
You can buy an X2 lite from the
The Console Corner for $40.
I would also suggest getting the X2 lite programmer as well. You mite have some trouble getting that dreadful cornwall BIOS off if you have a picky DVD-Rom drive.
As for an install, I would suggest Bill at
New Age PSX & XBox Service, he dose good word. A lot of people send their PS2s to him to get modded. Hes in Chicago by the way.