Hi Stuart
I've been on a number of golf trips over the last couple of years and David Ingman has proved to be extremely reliable and good value each time we have been out there. www.condadoexcursions.com. If you get in touch with him and let him know which courses you are planning on playing, he can give you an idea on the price to and from each course. He has also always picked us up from the airport, on time and hassle free, even when we were delayed.
In regard to courses, take a look at www.clubmurcia.com. Im most cases, I've found them cheaper than contacting the course direct and also any other website. They have some fantastic offers available. We played Las Colinas last year for €50 each with a buggy, which I believe is normally nearer €100 per person without a buggy. Other courses around also offer good value including Lorca and Hacienda de Alamo. I've also played Roda, Peraleja, La Serena, Altorreal and of course Aguilon which is a huge test for any golfer (lots of ravines) but has some great holes. Those you mentioned are also obviously great tracks but the Jack Nicklaus courses don't tend to have many offers on them in regard to price.
Cheers
Ruley