No, i do not wish i had bought a PS3. My 360 has been very good to me and i am very satisfied with my choice. I am not a very hardcore gamer, and i find that the Xbox 360 has a very good amount of games that you don;t need to go online for to still have a lot of fun. After a few months of researching, i found that for my preferences of games, the xbox would have been the best choice.
Long story short, i lost faith in Sony when the PS3 was announced. My PS2 was a great friend, but Microsoft became my choice for this generation.