use your head before purchasing mining equipment....

[Amph]

this should always work when investing in miners

digits before the point are what you need in GH/TH ecc.., and their cost must be the difficulty/2

example

now we have 65M difficulty, so you need a 65GH/s with a max cost of 32.5 btc

ROI 3 months

That is all well and good however a few details should be considered.

The network difficulty is going to be 85M+ within the next 24 hrs.

The next issue is how long before the hardware is in hand and running.

How much backorder product is going to hit the network within the next 3 months?

Unlike GPU hardware, with its resell value intact. The risks involved in mining with asic's can be costly.

actually i was wrong cuz with increase in difficulty, the number that you divide for should increase to(same % of difficulty), in other word the  cost of your miner should remain the same

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All right it will be interesting to see what they come up with.

As for right now, andrewboy44 thinks we shouldn't order any mining hardware from anyone? Just give up and let the 'big boys' play with their toys? Defeatist attitude?

Pre-order = lending money to people who will use it to make your gear obsolete.  Simple as that.  Without the pre-order money, *none of today's ASIC manufacturers would exist*. 
Network more secure?  Lol, eligius.­st is down, ghash.io hashing at 140TH/s, network hashrate seems to have dropped 200TH/s in less than a day -- you tell me. (nothing against Bitfury, i think they're awesome)

[polarhei]

Also consider dropping your electricity costs down to zero by setting up alternative energy. It could be solar or wind. That will increase your BTC profit margin. You only need few panels to power up ASIC Miners.

One direct way is using cooking oil to reduce the amounts of fans as the stable temperature should be 336K.

I am working on this, But Lack of money to do.

[Sitarow]

Also consider dropping your electricity costs down to zero by setting up alternative energy. It could be solar or wind. That will increase your BTC profit margin. You only need few panels to power up ASIC Miners.

One direct way is using cooking oil to reduce the amounts of fans as the stable temperature should be 336K.

I am working on this, But Lack of money to do.

Well 3M makes a better liquid to manage thermal footprint with hardware submersion

P.S.

Here is the new hardware return vs network increase outlook.

I fully expect it to even out some time after november 2013 as people start to get a realization that hardware price is too high at this time.

https://bitcointalk.org/index.php?topic=273264.msg3077414#msg3077414

[polarhei]

Even submersion (Cooking oil should work like 3M solution as the material, possibly from "oil fish" more than from crude oil too) is applied to control the cooling cost, You still need massive amount of accelerator to follow up (Can you own more than 2Th/s SHA-256 Array yourself?). I think, This may be the time to switch to scrypt if you are completely new.

Additionally, I have heard there is a group of people trying to use GPU to XOR the result from SHA-256 array to speed up the harvest. Invest on Scrypt Instead of SHA-2 pure is currently a good idea.