The obvious answer is a Miata. I have two friends with aftermarket turbocharged Miatas. The cars are the "NB" generation (one a 2000 and the other a 2004). They spent $5k-9K on the cars and $3500 for the turbos installed along with new clutch and flywheel. The cars make about 200whp and 200wtq or around 230hp/230tq at the flywheel. It doesn't sound like a lot, but the cars weigh around 2300lbs. The Miatas are pretty quick and should be in the mid 4 0-60s and upper 12 second 1/4 mile range. They feel even faster because they are low and tiny. I help them do work on the cars and the Miata has a straight-up race car chassis. They are damn easy to work and parts are cheap. I love driving them and I fit (barely). I'm 6' 1", 175lbs. I'd definitely fit if they had aftermarket seats.

On the flipside, I've owned a 2016 BMW M235 since new in early 2016. The car has 60K miles and have been trouble free. I've done routine maintenance like oil/filter changes, spark plugs, brake fluid, coolant replacement, and filter changes as well as preventative maintenance including an accessory belt ($30), tensioner ($110), and coolant overflow hose ($40). The car has never had a warranty repair or failure. It's due for new front rotors and pads all around. OEM parts will cost me about $600 and about 2 hours of my time with very basic tools. BMW has made significant strides in quality in the past 10 years. They are still expensive to maintain, but if you're a shadetree mechanic, they're not too bad. My M235 is a 6MT and is pushing around 450hp/450tq with a tune, downpipe, and some other basic mods. It hauls, especially after 40mph. It's still on the stock clutch too. The car is built exceptionally well and doesn't have a single rattle.

I'm currently looking at 2003-2004 C5 Z06s as a fun car and occasional auto-x. I thought about a Miata, but I'm more power hungry than my friends and wanted something different. Once I get the Z06, I'll likely sell my M235 and get an automatic 2018-2020 M240 or 2016-2018 M2 DCT. I love the 2 series, but I don't want two 6MTs.