Well I have 2 5870's running the gui-miner I just setup the solo miner how long does it usually take for 750mhash to solve 1 block also how many bitcoins usually in a block? Have been using deepbit and don't know whether solo mining or deepbit would make me more bitcoins please answer my questions would love quick responses!
Using a pool is about reducing variance, in probability you'll get 3% more (pool charge for deepbit) in the long term mining by yourself. Using that setup though average will be 14 days odd (and longer soon) to earn a block of 50BTC, you might be very lucky and get it the first day, you might be unlucky and not get one in a year. I use a similar speed rig (single 5970) and think you're better off reducing the variance and getting a more known amount, especially given all the difficulty / exchange fluctuations. Recently I've been getting about 3-4 BTC a day using that setup, although use it for other stuff so it's not set aggressively. But getting payments every day or two means I can trade / sell etc more often.
