I'm planning to buy parts to make this rig:
https://en.bitcoin.it/wiki/Mining_rig#One_ATI_5830,_Approximately_245_Mhash/s
In about a month.

In a month will I still be able to get the same overall profit as I could with that now?
I realize the difficulty is increasing which means you make less bitcoins, and therefore less money, but doesn't that also mean a relative increase in the value of each bitcoin which should even it out?

How the hell does that happen?
Why not put the computers in a room with a window and a fan?
How many did he need to have for that to happen?

You know the newbie post limit thing has a purpose.
You can't just spam your way out of here.

Have had the GUI GPU Miner up runing at about 10.8 max Mhash/s for over a day now.
Gonna get a CPU miner going if I can, and it gets at least 3Mhash/s.
Within a month I hope to buy a rig for about 300$ that will get ~250Mhash/s.

Just curious, I've seen rigs on the wiki with over 2.1Ghash/sec which can make up to 114 bitcoins at the current difficulty.
And I was wondering if anyone else made coins faster than that?

Your generation rate is pretty bad.
I mean, not to be rude because it's not your fault, but you will get nowhere fast with that.
However, if you do get a decent rate (at least say, 10Mhash/sec, and even that is quite low) then eventually, yes.
Right now you're looking at a maximum of 3 or 4 cents a day, and after fees are taken off, possibly nothing.

I got this cpu miner:
http://forum.bitcoin.org/index.php?topic=1925.0
Installed it.
Opened cmd and changed my diectory to it's.
And then I typed:   (without quotes obviously)
"minerd.exe -user DrenDran.next -pass notgiven -url http://mining.bitcoin.cz:8332"
And it just shows the help text.
Why is this?
What is wrong with that?