I have used both the Maverick 73 and 732. They have both worked well for me, and I would highly recommend getting a 732. As Hank pointed out, the 732 works in a wider range of temps, but the reason I prefer it is because of its longer range. The 73 would lose the signal when I got just a few yards away, but the 732 works through all the walls in my house and etc.. Plus, it makes a beeping sound when it loses the signal-- the 73 would just go blank and quiet.
I have to say that neither has great design or interface-- the 73 has the on/off switch mysteriously hidden inside the battery cover, and even the 732 requires some really weird and non-intuitive and time-consuming button-pushing to set the alarms for high and low temp limits on the pit probe and high limits on the food probe. But wow, once those are set, overnight smokes become a much less stressful affair-- the Maverick will wake you up when your smoker needs attention.
One other thing I've learned the hard way: the temp probes are very sensitive to water damage. After working through a few, I basically never wash the pit probe, and clean the meat probe with a scrubber/damp sponge. Even a little bit of water will kill those things quick.
Enjoy your new toy, Marty!