Here's a pic of my flowering cabinet, which I got at Lowe's, for like $300. They have some almost the same exact size for about $100 too, which are plain white. They're about four feet wide, 20" deep, and around six feet tall. You can pull as much as a pound per crop out of this kind of setup. You can use a smaller light than I used, but I wouldn't go below a 250-watt HPS, and I wouldn't go above a 600-watt HPS. I settled on the middle size, 400 watts, personally, which has been working well.

Your mother/veg cab doesn't need to be as big as your flower cabinet. I like that one Fog posted there actually, as it's a bit bigger than what I use for veg. (I got some $40 el cheapo cabinets from WalMart for mothers/clones.)

The carbon filter I'm using (which you can't see in the pics, because it's on top of the cabinet hidden behind books and stuff) is this one, and it's been working great:

http://www.bghydro.com/BGH/Itemdesc....BDFS03&eq=&Tp=

It's rated for less CFM than my fan, but I have my fan dialed way down, because I purposely got a bigger fan than I really needed, just so I *could* dial it down. To dial it down, I use that Dial-A-Temp doodad in the third pic. I don't remember where I got that, unfortunately - some specialty shop on the net, don't recall the name though.