Should I buy an Ipod Touch now or later?

Although I love Apple's complete line of products, I never really cared for getting an ipod touch. Until now.. Now that I have a job I really want one. However... Rumor has it that apple will most likely release another Touch around september or october considering that they have recently released the Iphone 3GS as well as a somewhat new line up of macs. My birthday is coming soon and well it be nice to ask my parents for a Touch, but sometimes I think it would just be better to wait for a little more time. I say it because in my desperation I bought a macbook 13 inch aluminum body around march or so and well for the same money I could have gotten a mac that was a little better. It was only about a 3 month wait, but honestly in the end that's how Apple works... Make tons of products at different times of the year unannounced so that you can buy them in the attempt of trying to have their latest stuff. So you think I should wait in hopes of getting a better Touch around September or October(since my birthday is in august) or just get it now and maybe get the newer Touch next year?