Nice one and good luck with the build , to the question when is enough , enough for me it's when you are scared every time you plant the right foot and prey the power does not overwhelm the tyres and splits you into the scenery ,now I have over 900 all I can say is its bloody amazeing , knowing I have more power than I will be able to use on the public highway is worth the cost to me , I drove up to autosport on cruise 25 mpg in comfort and had a little blat as still getting used to the power ,it's like a top end sports bike you can never use all the power ,for me half the fun is re learning to drive the car you will see what I mean when you get yours back but if you need a fix and you are not to far away I can give you a go in mine ,