Iphone 4 New Version?

[Keep them J's on my Feet]

I only have had my Iphone 3Gs for about 6 months, and Im trying to sell current phone to buy Iphone 4 just need some opions, do you think I should get Iphone 4? I would hate to buy Iphone 4 and begining of the yr Apple comes out with a better version of the Iphone 4!

thanks in advance.