Hi Lburns99!
I went straight ahead and bought both levels as intuition was very strong that I should and I am very grateful I did. I was only thinking just that thought last night! There are many parts to Level 2 that make Level 1 more powerful such as Virtual Compass and the sitting postures advice for getting into full lotus. It just seems so much more complete when you have both parts.
It also took some 5 weeks for the course to arrive and to order Level 1 and then desperately wish to have Level 2 soon would be frustrating but would teach you patience - at least then you would have a burning desire and increase proficiency with the active exercises.
Master Lin says to move on to Level 2 exercises when any pains and symptoms you may have, have been dealt with. The Level 2 exercises boost your capacity to be a better healer and be more effective with it but also to allow the Qi to flow through you more. If you still have blockages this won't happen so well - hence stick to Level 1 until those blockages dissipate.
As for mixing up exercises Master Lin is quite clear NOT to mix up different movements whilst doing a session of SFQ - but at other times of the day I don't see why not do other forms of exercise. I lift weights, do some Egoscue exercises, even a few yoga moves if there is time but I always make sure that SFQ is pure.
I have ordered the Born A Healer book from the US and am keenly awaiting it!
I too feel a great kinship with everyone here - I read a lot of posts here before the course arrived and learnt a huge amount that has helped me.
So hope that helps give you some advice in making your mind up!