I'm not sure how to solo mine though. Besides, I'd really like someone who has experience with solo mining with a powerful system like a dual or triple high end SLI/crossfire to give me some feedback, maybe tips and such.

Hi. I'm in the process of putting together a rig with dual 6990s with the hope of using bitcoin miner to subsidize the price of my system in the long term. After some calculations, I came to the conclusion that with minepooling I could get around 120 bucks per month with this setup.
I don't pay electricity so the only cost I have to consider is the system itself. However, I am now wondering if it wouldn't be better do try set up my own mining operation instead of going with a pool. I've read it can take weeks and up to months to solve a whole 50 bitcoin block. So I'm not sure what to do...

If i go with mine pooling, I got at least 30 bitcoins per month assured. If I go with my own operation and get lucky, I might get 150 bitcoins in a month, or it might take me 3 months to get 50. I've just started so I'm pretty sure I'm missing a piece of the puzzle here. I'd appreciate advice from a more experienced miner in regards as to what I should do here. Thanks!