Mining rig reccomendations and help?

[Beast911]

So i am building a rig for a buddy and i just need to make sure what i made is 100% compatible and fairly good for mining.

The build consists of:
1x 10 port 3.0 usb hub
http://www.amazon.com/gp/product/B00DRLZFPE/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1AMUYYA3CT6HJ

1x Raspberry pi Model B
http://www.amazon.com/gp/product/B009SQQF9C/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A1COA7PWTAABOP

1x Transcend 8gb class 10 SD card
http://www.amazon.com/gp/product/B003VNKNEG/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

1x Raspberry Pi Case
http://www.amazon.com/gp/product/B00AZL16S4/ref=ox_sc_act_title_4?ie=UTF8&psc=1&smid=A02211013Q5HP3OMSZC7W

8x Bitmain Antminer U1 USB Block Erupter 1.6Gh/s
http://www.amazon.com/gp/product/B00HIUIGDI/ref=ox_sc_act_title_5?ie=UTF8&psc=1&smid=A2CLVI402MS5P1

2x ARCTIC Breeze Mobile USB-Powered 92mm Portable Fan
http://www.amazon.com/gp/product/B003XN24GY/ref=ox_sc_act_title_6?ie=UTF8&psc=1&smid=ATVPDKIKX0DER


The total is about 590$ i just wanna make sure i get no hiccups and don't have to spend hours trouble shooting. If you have a better build for the same price or less then let me see it.
I have a bitcoin calculator that says at the current dificulty factor (2193847870.1743) i should be expecting 0.004 coins a day ($3.46) is this accurate?

[vpasic]

to be more precise 0.0036btc/day and less and lass with each difficulty jump.
best recommendation, forget about it.
never going to ROI with that and you can sure forget about any earning.

[crocko]

Consider to buy BTC instead of purchasing mining gear.
More safe, more profit.

[p2pstamp]

I post video reviews of unboxing and actual earning on my website. I'll provide a link to a miner which in my opinion is the best option at this point.
http://www.youtube.com/watch?v=exwqq7cv0Tc&list=LLl_9wEdl84HuEMdj6Wc7-zQ