Lee, last time you tried to ride a 400 you were probably 19 stone though mate!

But yes you are right on the power i guess, my last 400 was well into the 80s (89bhp IIRC) so thats probably putting rose tinted specs on me from the point of view of looking at 400s

600 though is definately a better idea than a 900 or 1000+ IMHO