what lens is best for my slt a-77

[wilkilad]

i have a sony alpha a-77 i have the startard lens for the camera but in june i am going to see the british super bikes at would like to get some fantastic close up shots ive been looking through alot and seemily the 400mm lens is the best for its price but would like a little more help if thats possible never done anything like this so yeah haha kind regards liam

[DistantMelody]

Thank you Marashfo

I found some Kenko extension tubes on Amazon. 

I wanted to buy the macro lens you mentioned. I will see. There is a lot to think about.