i have a GT4. It's not my daily driver, but i think i could DD it if i wanted to. It's not going to have as many 'use cases' as a four-seat, full trunk M3 though.
The suspension is not harsh at all. It's actually a marvel that it's as comfortable as it is. But it's not a luxury ride by any stretch. The gears are indeed too tall and that was annoying. I had to modify it so that it pulled harder in midrange, and now i find the power delivery to be perfect.
The OP specifically clarified that he wanted a high-revving N/A car. The GT4 will certainly deliver that as long as you're ok with a small two-seater. Although tbh i prefer my 997 GT3 if i were to recommend a car that really screams.
some cars that are cheap right now and might fit the bill:
- E46 or E90 M3
- Honda S2000
Not cheap but awesome
- 997 GT3
- Shelby GT350
- Lexus LFA
