When it comes to stand hardware, you are very wise to buy more than you need. It's false economy to buy a lighter stand/boom than can handle whatever you're hanging on it. Ask me how I know...
Having said that, when you can get away with a lighter stand for a lighter job, your back will thank you on a location shoot!
I concur with Neuro on the lighter load, I also use the Manfrotto 420B for booming say a gridded speedlite as a hairlight. Very versatile stand, light and can be used as a regular stand of course.
For heavier loads (i.e. Profoto B1 in a 5' Octa) I use the Avenger A4050CS. It's a beast but with the wheels very easy to move around indoors and rarely needs counterweights. Compared to the Manfrotto 085BS it is rated to carry a max load of 66lb (!!), obviously not at full boom extension, but weighs roughly the same. Both are in the 35-40lb range. Caveat is that the price appears the same as the Manfrotto, the Avenger doesn't include the wheels. Overkill in some situations, but is rock-solid and I've never once worried about booming valuable gear or having a B1 come down on a model's head.Avenger A4050CSManfrotto 085BS
Oh and as an aside the Manfrotto 1004BAC Neuro mentions is also my favourite all-around conventional stand, it's my go-to for every other non-boom application. Manfrotto 1004BAC