I love Shiva Rea's yoga as long as she isnt getting too "fluid" or "free style".
Shiva's yoga tends to have an all-round focus on strength, endurance and flexibility for the most. If your emphasis is pure stretching I am not sure if you should also look elsewhere. However any one dvd by Shiva should be in the dvd library of every one who does yoga. You may also want to look into Rodney Yee's AM Yoga For your week. It has five 20 minute-ish routines with a strong flexibility focus. These should stretch you out without (hopefully) boring you. Especially if you havent learnt yoga before in a live class, the cueing on this DVD is detailed enough for you to still get more out of yoga as you would if you were aligning your body correctly. Yoga isnt about how deep you can go into a stretch but whether you are aligning yourself correctly. The flexibility will impove with time of you attempt the right alignment and are persistent with practise. Shiva does cue well, but I think she expects someone performing her dvds to know the basics.
My all time favorite Shiva Rea DVD is Yoga Shakti. It was her most "purist" yoga effort and of all her breathtakingly shot dvds is the most beautifully produced in my opinion. Yoga Shakti has tons of content. Many of the routines in Yoga Shakti are advanced. Many are strength and endurance focused rather than stretch focused. However the lunar flow on yoga shakti is both accessible and flexibility oriented.
If not Yoga Shakti I second the recommendations for Daily Energy Flow. Some of the routines are not flexibility focused but the Shanti, Heart and Water flows will fit the bill. I dont have this DVD but similar flows as these have been featured elsewhere on her dvds.
