http://bitcoinwisdom.com/bitcoin/difficulty  

 this calc has   value



 1ghs = 5 usd a week.    
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so If I  sold this  kit to you


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=151173097332

  for 125 usd  you may lose or make money. My guess is lose.

  If I sold this for 99  you would stand a better chance.  I could sell this for 150 on ebay if I had more of them.  The 125 I sold them for  was about 30 less then anyone else on ebay.


 I would say  the kit above is worth about  80-90 with current btc price.


If you mine on cex.io with this kit  you would earn  BTC NMC DEV and ITX coins.   BTC the NMC has some value.   You could then add more hash via the cex.io site.

 If you are new and find a kit like the above kit. for 80 bucks you should get it.    If you are new this would be a low cost way to get started.    Down the road you could add sticks.