I just got P90X in the mail and I'm so excited to start!  I have some ?s though.  I currently have 8 lb weights that are appropriate for me for most arm exercises.   Will I need heavier weights for other exercises?  Also, do I really NEED a pull-up bar and a "perfect pushup" thingy, whatever that is?  Money's tight with the wedding and saving for a house so I'm trying to figure out the minimum I can get away with, haha.  Thanks!