Greg,
I was checking out the website for trackquest just now... and noticed that it's $500 for a two day event!!
You should come out with the SoCal Alfa Romeo Owner's Club some time... any make/model car is welcome, and there are usually more Porsches than Alfas anyway
The events are always two days (Sat & Sun) and the club runs at Willow Springs, Buttonwillow, Laguna Seca, California Speedway, and others. Price is between $170-200 depending on the track (Laguna being the most expensive)... and you get LOTS of track time.
Check it out... there's a schedule at
http://www.arosc.org