I agree that using a cab is easy and pretty economical. I have also used Golden West Express, I belive they have town cars and mini vans only (they may have limos too). They were great and for our party of six that trip, it was actually cheaper to have them take us than run the risk of not being able to find a minivan cab and therefore needing two. My brother has also used them several times from both SNA and LAX. Their website will give you a quote.
www.goldenwestexpress.com
Its been a couple of years so I can't remember the price but I do remember being surprised at how reasonable they were!