Welcome Griz. Great name. I too started with a 924, then moved on to a 944S and now the 968.
If the maintenance was deferred, your biggest worry is the timing belt, which will pretty much total the average budget if it breaks. And perhaps the most dangerous time for the belt is when you're starting the car, so do get "the belts and rollers" done as soon as possible, and have the water pump given the once-over "while you're in there".
The 968 is very, very different from your 924 - it has balance shafts, variable cam timing, and a host of creature comforts the 924 did not. With proper care and about $1,500 in maintenance per year, you should have a very nice driver for a long time to come.