Looking to start the p90 system, soon

buying equipment right now

and was wondering about what range of dumbbell weights should i get?

like 10-25lbs?
or 10-50lbs?

thanks

gotta give us more info on your body type/size/sex. I personally use 5-50 and will be upgrade soon to 5-65

get 5's and 8's and 10's, then increas by 5's from there on out (15, 20, 25, 30, etc). I'd recommend 5's-30's to start, and as you get stronger you'll want to buy all the way out to 50's and maybe even more. Like vici said, it's all about body type, size, sex, etc.

If you go the cash Bowflex makes a great product, but be ready to drop about $400.

I wish i could get the Bowflex dumbbells, those things are nice but very expensive. I think ima get them soon for P90X+ cause its much faster paced and i have the golds gym adjustables and they take about 15s to switch out the weight plates.

The best way to know is:
1) what do you want to do?
bulk up in muscle mass (low repitition 8-10 with high weights)
get toned. (high repetitions with a lower weight)

2)After deciding above ask yourself where do i stand?
best way to answer this is this. Look at the exercises and try them out with weights either at home or at your sports good actually using the weights and also if you lifted weights before use past experience.

When doing this which ever you choose bulk or lean. Make sure that on your last two repetitions you are actually working hard for it. If you have a weight that's to easy than go higher.

3) Usually most exercises in the weight that you need to use vary from 5-10lbs.
Now if your work requires you to actually do heavy lifting and only do certain movements than the case would be different.

Well hope this helps.