Here's a re-post from a conversation with NeiChuan:
i like tai chi classics by Waysun Liao
there are other books as well, but nothing like studying with a good teacher! you didn't mention that you have one?
also, if you feel that your path has a devotional base to it; i recommend the Aghora books by Robert Svoboda.
for tao philosophy i like the I Ching translted by Wilhelm/Baynes
for chi/nei kung (any system really) there are various systems out there and many individual practices.
this can get either confusing, or potentially 'water-down' your practice so that one has a lot of material with little depth. at this point if i just wanted to 'go through' all of my material; it would take me about 6-8 hours! so, it is good to have some type of 'set' with a decent number of repetitions for a select number of key exercizes.
for me these days, i like to do my chan si jing routine (1 hour), i chuan standing meditation (40 min), chen lao jia yi lu 2-3 times (20-30 min), chen ball exercizes (strength training; 30 min). also i have some hsing i elements that i need to improve on, then theres i chuan walking, my guan ping form, peng lu ji an (chen), etc. i also have more material and as you can see this is a tall order.... are we aupposed to have a social life? what about eating? we're advised not to eat 30 minutes before or after practice.
in reality i attend a 2 to 2 1/2 hour chen class 2x weekly, a 1 hour guan ping/hsing i class 2x weekly, and workout with a fellow student 2 hours 1x weekly. that's about 8 hours a week, and i don't get to all of that material even on a single day.
another pitfall i found was that with my sights set on the transcendent, i would get frustrated easily if i wasn't essentially a monk. i think it is good to have reasonable goals, pick the most important exercizes/meditations, and if i feel inspired, do a bit more. that way, i feel a sense of accomplishment if i have met my goal, and am further inspired instead of disappointed with myself.
i dont know if you have those issues, but its something i wish i knew a long time ago.
from your emails it sounds like you are doing well.
-i hope this was relevant!