What is the best metal dust collector to buy for a hobbyist?

[Ome108]

Hi,
I have gone through quite a number of threads about this subject.
I just want to know which system should I buy for a basement shop, mainly for the new 2 by 72" grinder I will get.
Do I need a different collector for each metal I grind as to not cause a fire?
Thanks,
Jon

 

[AVigil]

A big bucket from Home Depot filled with water.

Seriously it is safer then all of the dust collectors discussed here.

 

[grizzled gizzard]

Check out the thread, "Wet Grinding". It's way better and safer than any dust collector, for pennies on the dollar.

It's along the lines of AVigil's response.