Nankang NS-2R in the track compound are good for the money
No road use , track only
Federal rsr
Toyo r1r
Nangkang ns2-r
Toyo r888
T1r is the budget/daily tyre
Careful, they come in street and track compounds, the street ones are fine but the track ones will be better for the track, they're softer and grippier.
True but the Street compounds will be tricker to go off colour on track, and can take more heat.