id go for the 12:1....i dont think with 10.6 or 11:1 ull make 200 without doin some serious work..right now i have an lsvtec with 11.56 and i dont think im pushin over 185whp untuned..i do think with some good cams and tune id make 200whp..but i changed my mind to go turbo..also i run 93 untuned and it runs fine..so i figure if u wanna make over 200..ull need atleast 12:1 and still good cams etc..and tune..of course..good luck..and dont hold back! ull regret it later..