A friend and I are starting up a large mining farm.. looking to start out with 10/15 GH/s, possibly more beyond that. At what point does solo mining make sense? I could see us going as high as 25/35 GH/s, maybe even more, if solo'ing was feasible.
For bigger pools, in the last 52 hours (from 2~3 hours ago when I updated my charts) or so, they had averaged about 0.67BTC per day per GH/s
Looking at smaller pools in the area of your target hash rate.
The bitminter pool has about 13~16Gh/s and found 1 block in the same time period, looking back to the previous block, gives them about 0.48BTC per day per GH/s assuming they found one block now.
Triplemining has about 80GH/s before the current round made many people jump, and found none in the past 4 days. But average the whole week will give them 0.36 BTC per day per GH/s.
Nofeemining has abour 34GH/s and found 1 in the past 52 hours for 0.66 BTC / day / GHs
The top pools has 81% of the network hash rates but generate 91% of the blocks, the remaining 19% average 0.27 BTC/GHs/day
While my data time is short, I believe there's a general trend that the slower the pool's (or a solo miner's) hashrate, the more likely they will be getting less than the expected mathematical BTC per GH/s. I think this is due to latencies but probably need more data to be sure.
So IMO, 10GH/s probably isn't worthwhile yet, despite the pure maths saying you can expect higher returns.