To go to 6.5" you need to consider:
Brake lines - need to lengthened
Trackbar - go with a nice double sheer one, you can either make one or buy one
Steering - your angle are your to be very steep, make sure to match your steering angle to your trackbar angle
Control arm angle - you could go with ironrock, some people like it and some don't like how it mounts to the one upper using their wierd castor thing, you can also do some drop brackets
Rear lift - I would go with a longer shackle and some relocation brackets, don't use blocks
Drive line angles - probably going to need an SYE no later the year at that height.
Front lift - Coils would be best, but you can also do a coil spacer
Why the extra 2"? 4.5" is a good hieght and you can fit almost any tire with proper trimming and bumpstopping.
What are you looking to gain?