Concerning a recommendation of non-programmables, I certainly would recommend the TI-BA II Plus Professional (w/ silver case!), because it has MIRR & DPB (Discounted Payback) which might become handy (at least to get a ballpark figure to compare to more complex FMMR calculations ;-)
Also cash-flow handling is much easier with the TI than with the HP 10B. Although I use both calculators interchangeably, I prefer the TI for cash-flows. (Would you be allowed to use programmables, the HP17B+ would win hands-down !)
As another hint: Search the web (or the TI education site) for a PDF copy of the "BA III Guide Book", which contains a bunch of useful samples on calculating Piti, Buyers Qualification, Ellwood, CAPs, Wrap-Arounds etc.
My first intent to recommend the eventually still available TI BA Real Estate, doesn't make so much sense, because it lacks the clarity of the keyboard layout for standard TVM tasks(Edited: 25-Sep-2006 ... and it lacks Cashflow Functions too ...)
Best regards,
Peter A. Gebhardt
Edited: 25 Sept 2006, 3:36 a.m. after one or more responses were posted