I bought this carbon fiber one
DYNATRAN AM-107CF MONOPOD BASE AM-107CF - Henry's best camera store in Canada
once I knew how to use it (hold it steady) I just love it. I am guessing at this point (just got it) that I save 2-3 stops over hand held. it is light weight, very strong and shaft is around 1 3/8 inches diameter near the top (the grip looks to about 1 3/4 inch diameter and very comfortable)
the bottom leg it 3/4 diameter.
Max. Height: 59"
Min. Height: 17.7"
Max. Weight it can hold: 17.6 lbs
I tried a less expensive model and I wouldn't buy it as it is too flimsy (you can lean on this model and it barely flexes)
I wish I would have know they had a version with a ball head but it wasn't avalible or on sale.
Here is a couple of examples using the monopod indoors low light.
1/6 sec f5.6 ISO 125
same but cropped
I could not go under ISO1000 hand held to get even close to this result for this type of lighting
good luck
randy