I became a fan of Honda products while working for a Honda dealer for 8 years. (The Accord V6, Civic Si and the Acura TL were favorites.) When I began my time, Hondas were practical, economical, good looking and most of all Fun-to Drive! Now they are just a wannabe Toyota-clone appliance with driver fun/involvement blunted by tastes (and pocketbooks) of those who hate to drive.
If you like your TL's level of fun, refinement, luxury and driver involvment, I would recommend the Mazda6 or Mazda3. The mid-range 6 and top level 3 can be had within your budget. They offer everything you desire, including manual shifting transmission and a naturally aspirated - high revving engines in all trims. Both have georgous interiors and a chassis that is a gift from the driving gods. All this and MPG in the 30s. The 6 is bigger, quieter and more refined than the 3, but the 3 is more tossable and faster (at least with the 2.5L). Whichever you choose, both are an absolute hoot to drive!
When we were looking for our next new car in 2013, we looked at nearly all the choices. The Civic was bland and cheap, the Imprezza was slow and bland. The Forte and Elantra boring and dull. The Golf GTi/Jetta GLi were fun, but out of our budget as was the Mini. Finally we happend on the new for '14 Mazda3 and BOOM! This is what we were looking for. Within the first 2 miles of the test drive, my wife looked and me and simply said "yes". Our 2014 Mazda3 S Grand Touring Hatchback now has 25,000 miles and has been trouble free. During the commute it is a friendly economy car, but press the "Sport" button and it comes alive, eager to eat tarmac and chew up the curves. My co-worker has a 2015 Mazda6 S Touring and he has the same thoughts as I do. We love our Mazda and their stand against the flow of the rest of the auto-appliance industry. Mazda builds cars for those of us who love to DRIVE! With Honda's slide into mediocrity I am grateful we found Mazda.
Good luck with your search,