Mining for rent

[herbertfilby]

Ok, so I have been half-@ss mining with my Geforce GTX 580, getting 120 MH/s and I am looking for an upgrade. My overall goal is to make at least enough to pay for rent, which is $600 a month. Using the mining calculator, I figure I need to be running at least 620 MH/s (not taking difficulty and exchange rate changes into consideration)...

Now, I'm looking at investing in a new graphics card, but here's my situation.

I have a computer just sitting here with i5 CPU and about 6 gigs of ram, and on-board graphics card (which is crap), and I have my main computer with the GTX 580.

Now, I know that difficulty increases has made mining less profitable, but would it be worth it to go nuts and spend $450 on a Radeon 5870 and put it in the old computer? or just get 2 5830's for $100 each and put one in each computer?

I plan on joining a pool, so it's not like I'm trying to solo here on 600 MH/s 

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[sirky]

5830's.

[TurdHurdur]

Don't rely on it, have a stomach for risk, all that jazz.

[SgtSpike]

Go with the 5830's.

[herbertfilby]

Thought so, looking at the charts. Thanks all 

[TiagoTiago]

Do you pay for the electricity? You need to take in consideration how many watts you use for each hash/s and see how much the power company charges per watt.

[RyNinDaCleM]

A single machine would also make for lower power usage.