user1498: Actually is there a list of hardware we could use and their bitcoins/hardware price ratio so I can compute return of investment?

user323: FPGAs in general cost more initially per given computational speed, but use less power per MHash/s. Currently, the good GPUs have a faster return of investment time, but they are highly dependant on difficulty and Bitcoin price.
To be more specific, find your desired hardware in the "Mining Hardware Comparison" wiki page, and then do some calculations (you can for example use my mining calculator).

user1307: Here is a very detailed list of known mining hardware and it's mining-specific specifications:
https://en.bitcoin.it/wiki/Mining_hardware_comparison

1498: <p>Actually is there a list of hardware we could use and their bitcoins/hardware price ratio so I can compute return of investment?</p>
 323: <p>FPGAs in general cost more initially per given computational speed, but use less power per MHash/s. Currently, the good GPUs have a faster return of investment time, but they are highly dependant on difficulty and Bitcoin price.</p>

<p>To be more specific, find your desired hardware in the <a href="https://en.bitcoin.it/wiki/Mining_hardware_comparison" rel="nofollow">"Mining Hardware Comparison"</a> wiki page, and then do some calculations (you can for example use <a href="http://tpbitcalc.appspot.com" rel="nofollow">my mining calculator</a>).</p>
 1307: <p>Here is a very detailed list of known mining hardware and it's mining-specific specifications:</p>

<p><a href="https://en.bitcoin.it/wiki/Mining_hardware_comparison" rel="nofollow">https://en.bitcoin.it/wiki/Mining_hardware_comparison</a></p>
