It is difficult to answer your questions without knowing the current condition of your truck.
For example you get a BTS (great tranny) but your ball joints and tie rods are shot. Was that a good call?
Here is what I would do in your shoes.
Call Rudy's (They are a sponsor on here with a great reputation in Durham NC, see sponsor section) tell them you recently bought the truck and don't really know what condition it is in.
You want all service caught up. You also want there opinion on upgrading your truck based on its current condition and your goals for the truck.
It won't be cheap but it will be the best time and $$$ you can spend.
Until then you will not get good feedback on what to do to your truck.
You might as well get a decent set of gauges installed while you are there.
Once you know what you have, then come back and tell us your goals, budget and timeline.
