Since it seems that the TI-84+ SE, though released 5 or 6 years ago (?), is widespread and appears to be easy to use, I might go with it albeit its lower resolution when compared to the TI-Nspire. Hypothetically, would the TI-Nspire be nearly the same as the TI-84+ SE if I snapped on the TI-84 keypad?

The reason I ask this is because the two are nearly the same price from the merchants/sellers I'm looking at. Here is the TI-84 Plus Silver Edition (with fulfillment by Amazon) for ~$121 and the TI-Nspire for ~$125 (with fulfillment from Amazon) .