While I have not personally owned these cases, I have been doing some reading and searching on cases recently and currently.
LIAN LI PC-V1000APlus II
You do realize this is a mid tower, while the other two are full towers right? Thought I'd mention just incase
. One of the great things about Lian Li, is that they are designed in such a way that can be easily and greatly modified. That's one of the perks about this brand. I don't think most know that about Lian Li's. Plus the part about them being all aluminum which makes it much easier to make changes wherever you want. Very high quality craftsmanship built with modders in mind. So if you plan to mod your case Lian Li is definately a brand to consider there.
If you want a Full tower from them you can get something like this
One of the nice things I like about (most of) the full towers, is the ability to put the PSU on the bottom. This helps efficiency of the unit as well as the other components.
These are solid cases, and again, perfect for mods. If you don't know that much about modding, just browse around in the Case Mod Work Logs section, or look for the threads. Most of them have [Project] in the title.
Thermaltake ArmorPlus(Armor+) VH6000BWS
Another fairly well built case. One of the things I don't like as much is the window. There is a 230mm fan in there, and while that is helpful, where are you going to find a quick replacement? You would have to try to get one from Tt (not sure on $) or mod/replace the window to put something different. The handle on that panel makes it a little tedious to change IMO. As I do recall, you can get a replacement panel, but that's like another $50. Another thing (and correct me if I'm wrong guys), I believe the HDD cage would have to be removed to fit some of the longer video cards. I know that my 9800GTX is quite long, as well as several others are. That cage comes out easy though. As far as craftsmanship, I have heard good and bad. They do have a bit of plastic all over the cases.
Another nice feature, is it has a mesh front panel similar to the Cosmos S.
COOLER MASTER cosmos S
I was looking at this case. It's nice in that one of the features this one has over the earlier Cosmos, is that the front panel is meshed. Great air flow potential there. It has place for 3 120's on the top panel, though I'm not sure how much clearance there is with those mounted. The PSU is also mounted on the bottom of this case. However, this case has some querks to it that I don't personally like. The side panel is limited in the ability to mod it. The mesh sticks out a little from the case and it is odly shaped. The inside of the panel has plastic all over it holding the fan in place. It's a giant dust hole IMO. Another limiting factor, is the drive section is all one piece which goes all the way down the front of the case. I have not yet heard any issues about video card room, but I have read that many are/were not impressed with this case overall vs. the earlier Cosmos
Also, a lot of plastic on this case. The back panel also seems to be limited for some reason. There is a bit of space on the top that is wasted. It has 2 holes there for water cooling in mind, but other than that.. I dunno.
I also read that the tooless holders for the drives can be loose sometimes, not holding your components firmly in place. I've read that a couple times though so it was likely those specific cases and not the entire line.
I hope this info helps you in your purchase. I might not be 100% accurate, but I'm close
I think I am going to be getting a Lian Li myself. I plan to heavily mod it before I even mount anything in it. Removing rivets and everything