Budget chip: Generic TS 6-pos chip off of ebay for $260 shipped.
eBay Motors: TS PERFORMANCE CHIP 94-03 FORD POWERSTROKE 7.3 DIESEL (item 320197075225 end time Dec-25-07 20:20:25 PST)
Digital gauge kit: this is what my truck came with:
BD Engine Brake - Ford Diesel XMonitor Digital Gauges
DP Tuner can also burn you a chip with just one or two tunes that won't hurt your tranny too much. Anytime you increase power you will decrease the life of the trans a little bit, and it can bring forth problems sooner rather than later.