Just put a set of Kumho ecsta spt on my 04 SVTF and I'm really happy with the results. I did alot of research on ultra high performance tires. I didn't want to spend as much as the stock conti's cost, but I still wanted good performance. I got both with the Kumho's...
2007 Mazdaspeed 3 GT: TurboXS DP/RP, CP-E SRI, Forge BPV, SU rear MM/solid shifter bushings.
2004 Silver SVTF ZX5: JRSC, MBRP, FRPP Multimatic suspension, Progress 22mm RSB, stage 2 TB, Steeda STS, CFM rear MM, Black OZ Evo's.