E85 is becoming hugely popular, altho we get alot of variance between petrol stations with fuel so you dont mind many street cars running it at all, but in terms of Drift/Drag/Circuit its getting massive.
In regards to the injector choices.
550cc side feed = 220-230kw
740cc side feed = 250-260kw
850cc side feed = 260-270kw
1000cc top feed = 290-300kw
2000cc top feed = 350kw +
I was going to put my street car on E85 since i would only do about 1tank a week so it would be ok, but decided against it and would rather just look at doing NOS or other extra's to give that power jump, but it definetly has its rewards if it suits what your trying to achive