How many bitcoin would you expect to make a day with one of those? Mining in a pool.
You're not going to make anything form it if you don't have it. ;p
Both Dargo and John gave you accurate info.
to add to it all a bit; If you want to do a bit of math yourself there are many options to use to calculate either the earnings from having $1300 worth of BTC bought now, through to NOV+++ when you would at the earliest receive an SC if ordered now or the 'speculative' potential earnings of a unit then. My head is almost spinning thinking of all the differnt options now. ;p Let's examine a few basic ones.
1. Buy SC now, $1300/$8.56(current 24h avg) = 151.87 BTC - If BTC price moves up to $n above current you will lose whatever increase opportunity could be there.
example; BTC 151.87 @ $8.56 now = $1300 By NOV+++ it could be BTC @ 11.77 x 151.87 = $1787.51 Just by having an undelivered order you would lose $487.51
of your currencies value for this example.
2. Buy SC now, NOV+++ later you receive your unit. With the previous examples price increase your unit has now cost you $1787.51 That's still not a bad price for 40GHs, or is it? By the time you get an order that is placed now there will be the new network TH to compete with. A very conservative estimate would put the difficulty after just the first 500 orders to ~139M. Assuming average of One 40GH SC unit per order.
This is just the first 500 orders, of which at this point there are more like 1800 orders ahead of one placed now. The earnings of one SC unit under these conditions and not accounting for any already existing equipment hashing, just the newly added stuff can be seen here;http://tpbitcalc.appspot.com/?difficulty=139689980.3050&hashrate=40000&exchangerate=8.61&bitcoinsperblock=50.00&rigcost=1800.00&powerconsumption=12.00&powercost=0.12&investmentperiod=355
And that is before the block reward going from 50 to 25... Cut your weekly earnings in half after that point.
3. Buy your 151.87 BTC now, split it among 3 or 4 of the more conservative GLBSE stocks. At ~1.05% per week, compounding; at the end of just 19 weeks (end of NOV), you will have a total BTC value of BTC 185.38 @ current market would = $1586.85. At our previous example's rate of 11.77 the BTC 185.38 would be worth $2181.92 For a gain of $881.92
These are all just examples! The point is to just do the math. Like any other investment, do the math and then calculate the risks of any result you come up with. I.E., buying BTC to hold, price could crash. Buying SC, delivery could not happen until Q2+ 2013. Or the opposites of each.
If none of that makes sense in the way that I am explaining it, I will not be offended if you say so and will happily clarify any points I failed to get across.