If all else fails
Mita
Is
Always
The
Answer
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Can't go wrong with a Miata. The Fox-body needs too much work to get it halfway decent for cornering. The 944 does ok but is underpowered and the consumables are expensive - brake rotors and pads, ball joints, bushings, tie rod ends, etc.
If you daily a FiST, I'd strongly recommend another FWD for track use. The learning curve is short and everything you learn about left foot braking and lift off oversteer can be carried over into the FiST. Platforms I like for track use are the slightly older B15 Sentra SE-R SpecV with the Brembo brakes. They have a 2.5-liter inline-4 that's a torque monster (relatively) and similar rear suspension to the FiST so they are quite planted and don't need much to handle well. The factory Brembos are a nice bonus as well. the SpecV came standard with an LSD and that's a must on a track car.
The point of track days to me is to learn car control and to have fun. You're not having fun when you're buying $2000 brake pads and rotors. You can buy a SpecV for $3500 in mint condition and go straight to the track with it, and do surprisingly well. It already has all the major upgrades that you'd want for track use (LSD, Brembos), and consumables are cheap and easy to find.
Fwiw, I have a 2012 Z06 that I initially used for track days but the first brake job on it was close to $3000 for just the front pads and rotors, so I got smart and committed to my Sentras. I bought one of my Sentras for $1800 and put about $150 into it and passed tech and started lapping with the big boys.