Thanks to all -- you've been a great bunch, and I've got a lot to think about now.
I automatically put IPD swaybars and those chassis braces on all my 240's (and would with a 740, too); Eurosport Tuning's large slotted rotors (Cadmium plated to prevent rust on those cars I only use on weekends -- as my daughter's car would be) and calipers, too; new tires; upgrade the radiator with IPD's (Nissen's); transmission cooler for those with which I tow my boats; etc. So whichever car (240 or 740) I get for her, it will be well prepared -- and I'll be using it first for almost a year to get all the "bugs" revealed and fixed (she really doesn't want it until next summer, when her boy friend moves to grad school -- right now, they can only keep one car between them -- street parking restrictions in Cambridge). And, of course, she's already on my family AAA account, etc.

I was really thinking about the SIPPS system, vs the drawbacks (brakes, etc.), so I'll keep all your advice in mind.