much thanks to everyone for their input. I finally made a choice & ordered my new Mister Mac on Sunday.
Sirmausalot, your suggestion was what my gut was telling me to go with all along. I DID consider picking up last years model, but the siren call of having the latest toy won my heart.
On order: 27" 5K w/ 3.2GHz quad-core Intel Core i5, & 2TB Fusion.
yes, i7 would've been nice but given my budget, I had to make some tough choices. I feel good about my choice & am insanely excited for it to arrive. ...she types from the creaky keys of her 2009 MBP.
Now if I can just make it through more than one page of the RAM thread without my brain melting. CL10 vs CL13... DDR DDRL... R2D2... C3PO... whaaaaaat?!