in the long run (as in i don't want to be buying another bike 12 months after i get my next bike, which would be better so would it be better to get a older (say mid/late 90's) powerful bike (900cc or more) or a newer smaller bike (600cc-750cc) if i go from a 500 to a 900cc will it stint my 'growth' or would it just take longer to adjust, but will last me longer? or is the better option going a 600-750 cc? what i don't want to happen is i get a bike, then i have it for 12 months and want a more powerful one? so will a 600 or so sedate that urge for a few years or is a more powerful one the better option? thoughts ect.