Sell your 55-200 and do a little top up. Your lens range is overlapping with one another.
18-55 for wide angle
28-135 for general purpose
135-400 for shooting babes and birds
50 for low light
Although the 55-200 is covering from normal to telephoto range but I think your 28-135 has a better output in terms of sharpness and colour contrast. Ask yourself this question, "which lens do I use to most" and "what is my main interest (as in what you like to shoot more) in photography.
Renting a lens is ok but don't forget if you accidently drop it, it's as good as buying a new lens.